12ga to 357 back

357 12 Gauge Shotgun Adapters

(87 customer reviews)

$24.95$99.95


357 Magnum Shotgun Adapters for 12 Gauge Shotguns

Adapters come in 4 Lengths

2 3/4″ 5″, 11″ and 18″

All Adapters are Fully Rifled with a 1-12 or 1-18″ Twist.

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Description

357 Shotgun Adapters for 12 Gauge Shotguns

357 Shotgun Adapters Allow a 12 Gauge Break Action Shotgun to use 357 Magnum in addition to 38 Special Ammo.

For 3″ as well as 2.75″ Chambers

Compatible with Break Action single as well as double barrel shotgun.

 

Rifled:  with a 1:18 twist rate for the 11″ and 18″

1:12 twist rate for 2 3/4″ and 6″

 

357 Shotgun Adapters Rifled dimensions are .355″/.349″ with 6 lands and .125″ wide.

 

Black Oxide coating as a result provides notably better corrosion protection (for maximum corrosion protection keep a thin coat of oil on the insert)

 

Please Note:  Not all shotguns are the same!  While the majority of them are capable of handling high pressure rounds, some are NOT.  Only use these rounds in shotguns that are compatible.  I recommend on any shotgun to test the first shot in a vice while out of harms way and to always wear eye and ear protection.  If after testing you see the primer punctured in the round discontinue using this round and use a less powerful round. These high pressure rounds include: 45-70 gov., 357 Mag Shotgun Adapters, 327 Federal, 44 Mag, and 22 Hornet.  Please always be safe and aware.
Thank you for reading.

What are Shotgun Adapters?

Shotgun Adapters frequently called Chamber Reducers or Shotgun Barrel Inserts. Our shotgun adapters allow you to use other types of ammunition in a Break Action Shotgun. Including double barrel and over and under double barrels in addition to the popular single barrel break action. We offer several different versions to suit your preference in ammunition, as well as length. 12 and 20 Gauge shotgun adapters are our most popular adapters followed closely by the 410. 16 Gauge is something we plan on expanding in the future.

Warning!

357 Shotgun Adapters are a High Pressure round

However, not all shotguns are capable of handling all of the shotgun adapters we offer. Low-pressure rounds work in any shotgun, whereas high-pressure rounds can cause problems in some shotguns. The problem is when the firing pin punctures the primer. This event causes the gases to escape and possibly damage the firing pin. All adapters chambered for high-pressure rounds have red text on the website, signifying that is is a high-pressure round. These adapters also include a pamphlet with more information about this concept. In addition These Shotgun Adapters also have a Low-Preasure round alternative.

 

357 Shotgun Adapters

Most of our shotgun adapters come in different lengths to suit your needs. Some like the secure storage and portably of Shell length adapters. Whereas some are looking to get the most fps (feet per second) or accuracy out of their adapter. Black Oxide has become our standard finish. We can offer unfinished adapters during our production if you have requested one.

FPS (Feet Per Second)

As a general rule, the longer the adapter, the more FPS it produces. However, with low-pressure rounds such as the 45 colt, the fps difference is minimal once past the 11″ length. If you are interested, here is an excellent website that gives a good idea of fps per inch BBTI. All of our shotgun adapters are entirely made in the United States and are an affordable addition to your break action shotgun. Thank you for you interest in our Shotgun Adapters or Chamber Reducers. We are working to make more adapters for more calibers, so you can sign up to be notified here
The video below gives a brief demonstration of how they work.

We are working to make more adapters for more calibers, so you can sign up to be notified here. Thank you for your interest.

If you like 357 Shotgun Adapters, check out our other Shotgun Adapters

Additional information

Weight N/A
Dimensions 24 × 3 × 3 in
Length

18", 11", 6", 2 3/4"

87 reviews for 357 12 Gauge Shotgun Adapters

  1. Thayer M. (verified owner)

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  2. Gary R. (verified owner)

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    As always shipping was quick and product excellent. Thanks for the great job you do.

  3. walter d h. (verified owner)

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    best shotgun adaptor you can buy can’t wait to get more

  4. Angie (verified owner)

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    I ordered this for my husband and he loves it. It works perfectly.

  5. Keith Bayless (verified owner)

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    I have purchased two other adapters of different calibers prior to this one! I am very pleased with these adapters and I have been very pleased with the service I received in getting them! I have also talked with Chad a few times with questions about his adapters and he was very helpful! I very much appreciate everything! Thanks Chad!

  6. Robert M. (verified owner)

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    Great quality. Great product

  7. Dickson Alley (verified owner)

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    Let me start off by saying Chaszel barrel adapters are the finest I’ve ever owned. I own adapters from other companies, they don’t even come close to the quality of Chaszel barrels.
    I purchased the 45/70 & .357 12 ga 18” long adapters for my NEF single shot shotgun. I started shooting a steel target at 30 yds. Hits were at point of aim, moved target out to 45 yds still hit dead center. Took target out to 65 yds, still hit it. Considering my NEF has a 18” barrel and only a bead sight, I was amazed at the accuracy.
    Thanks Chaszel
    I can’t wait to try out a 22 lr adapter when ever their available.

  8. Norman Utter (verified owner)

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    great insert but I need one more for my over/under and you are out of stock. I also need two 11 inch .44 magnums for the 12 gauge.

  9. Anonymous (verified owner)

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  10. vaughn (verified owner)

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    this barrel is great shoots 2″ groups at 75 yards really happy with this purchase

  11. Edmundo (verified owner)

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    Very good quality products fast delivery.I wish they will make more rifle caliber inserts and magnum

  12. Charles W. (verified owner)

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    Shoots well, definitely worth the money!

  13. Charles (verified owner)

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    I was impressed by the quality of the barrel. I stated with just the one o-ring. I was having trouble with adjusting the sights to the point of impact. I pulled the adapter out and turned it 90° and the point of impact shifted for the better, so THAT does have a bearing on impact. It did group well, only shot one 3 shot group (2 holes touching). Since AMMO is SCARCE and EXPENSIVE I will try again but with 3 o-rings and check again.

  14. Anonymous (verified owner)

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    Excellent quality .357 magnum barrel insert. Your notification of availability worked and I was able to purchase a very accurate barrel insert for my single barrel shotgun. Hopefully the 12 gauge to 44 magnum 11 inch or 18 inch barrel inserts will be available soon.

  15. Anonymous (verified owner)

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    Great product thanks

  16. Par F. (verified owner)

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    Very nice product, it is well made and looks very good. It fits like a glove inside the shotgun barrel. Very easy to use. Overall very good .

  17. Dale Armstrong (verified owner)

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    fast service, have not used yet but will buy more due to other reviews

  18. Jonathan Johnson (verified owner)

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    Been waiting a while for this one. I originally bought the carbon fiber one. And after realizing there was a slight potential for it to have a failure Chaszel contacted me and refunded my money. Been waiting on an all steel one since. Tickled to death. thanks man.

  19. Anonymous (verified owner)

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  20. stephen (verified owner)

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    Quick shipping, top quality workmanship!

  21. David M. (verified owner)

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    Excellent shotgun insert. I’ll definitely purchase more when they’re available. Please let me know when I can get other calibers.

  22. Marco F. (verified owner)

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    Very nice well built quick response to my email thank you

  23. Larry Long (verified owner)

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    I have not yet fired it ,but it looks first rate ! Giving you benefit of the doubt . Well made . Waiting for you to build more ,Buuuudy !

  24. Fred T. (verified owner)

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  25. Donald Bingen (verified owner)

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  26. Brad Wiebe (verified owner)

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    Great quality and finish! Not my first won’t be my last!

  27. Anonymous (verified owner)

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    Haven’t had a chance to fire it yet. But looks fantastic!

  28. Rodolfo F. (verified owner)

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    So glad I bought it! Gave new life to an old H&R Topper that I have at my recreational property! That old shotgun can now be used to dispatch coyotes and varmints at a better distance than the shotgun. All the topper has for sights are a bead up front and a small notch centered on the receiver. I was still able to shoot 4″ groups at 50′ yards…

  29. LAWRENCE SHERIDAN (verified owner)

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    Extremely accurate, can’t wait to get one in 30-30!!

  30. Al S. (verified owner)

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    These things are very well made. They fit my CZ double barrel like a glove. They stop a few inches short of the muzzle and it really quiets them down. I’m going to remove some of the rim so the ejector slips past the barrel. This way the barrel will stay put when I open the barrel. Overall, I’m very pleased with them.

  31. Anonymous (verified owner)

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    Great sales response. The inserts fit tight in my double side by side 12 ga Rossi.
    Nice groups at 25 yards. Looking forward to getting the .44 mag inserts.

  32. Gilbert V. (verified owner)

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    This thing is awesome I will be sure to purchase another gun adapter it works great and was fun

  33. Anthony T. (verified owner)

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  34. Michael P. (verified owner)

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    Great products that work as advertised.

  35. MIchael Smith (verified owner)

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    Very well made adapter.I am pleased with the accuracy.

  36. Roy B. (verified owner)

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    I received my two 12 Gauge to 357 Magnum adapters in very good time from initial order. Upon opening the pack I could see that the quality in craftsmanship was exactly on par with other Chaszels review that I have read. Solid, Smooth and Clean machining of these adapters make them a must have for many years of trouble free use. I am looking forward to taking them to the firing range this weekend to test them out.

  37. Brian (verified owner)

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  38. Douglas Soucier (verified owner)

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  39. Anonymous (verified owner)

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  40. Donald (verified owner)

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    Outstanding quality. Be sure to follow the directions. And lube the o rings

  41. Don (verified owner)

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    Good workmanship. Great ship time.
    Hoping that chaszel fully restores their inventory . In order for me to purchase the numerous adapters I want to own.

  42. Patrick T. (verified owner)

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    Only thing I have to say is you all need to restock or launch some new calibers

  43. Cody E. (verified owner)

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    Very nice, exactly what I expected. I have a short lane adapter and your adapter is a hundred times better.

  44. james f. (verified owner)

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    I’m very happy with this purchase. It’s well made and I like the finish, and look forward to using it. Shipping was super fast. Thank you for a well made product. James

  45. John Brace (verified owner)

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    I’ve used it with .38 special and was impressed with the accuracy.

  46. Fred Tuckey (verified owner)

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  47. Ronnie m. (verified owner)

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    Very nice products. Will order more when available.

  48. Randy L. (verified owner)

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    It works just like to should oil the adapter and gun barrel

  49. Randle P. (verified owner)

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  50. James Shingleton (verified owner)

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    Super product

  51. SAMUEL DELUCIA (verified owner)

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  52. Bradford McConnell (verified owner)

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  53. TERRY INGOLD (verified owner)

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    Excellent workmanship, I’m looking forward to purchasing a longer version in 38 spc.

  54. Sidney wilbur (verified owner)

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    very pleased in every way, keep up the good work, still more adapters i plan to get, you guys have been best

  55. William Thomas (verified owner)

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    Beautiful machine work and adapter fits my shotgun perfectly. Quick delivery time was a pleasant surprise. I only wish the 45/70s and 30/30s were in stock. Regardless, awesome service.

  56. Terry L SMITH (verified owner)

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    Finally got time to try them out and they worked great.

  57. John B. (verified owner)

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    357- 12 ga , 3″ 40 yard group, no rest , with the short adapter. Goodernuff!

  58. STEAVE K. (verified owner)

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    Best Adapters in the market period!!

  59. STEAVE K. (verified owner)

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    Outstanding product!!

  60. Mark (verified owner)

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    The same as my first review.

    • Chaszel (store manager)

      Good Afternoon, We really appreciate your business and understand the frustration of having a shipment take so long to arrive. Your package was shipped Priority Mail the day after you ordered it. The Post Office has been very behind on a lot of there delivery’s due to Covid-19. Your tracking say it is arriving late but is still on its way and was updated yesterday. We realize the inconvenience of these delays and have now offered UPS as a shipping option. Sorry again for the inconvenience.

      Chad

  61. David T. (verified owner)

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    Great quality and workmanship!

  62. Anonymous (verified owner)

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    Great product

  63. James A. (verified owner)

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    Wonderful product looking forward to deer season.

  64. Anonymous (verified owner)

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    Always Top Quality. Always Outstanding Value. I trust Chaszel and tell others about them frequently.

  65. Carl (verified owner)

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    Chaszel makes 1st class products! I am pleased! Waiting for the 20 gauge/30-30 adapter to be made now.

  66. Michael (verified owner)

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    Better than expected. Easy to pull spent casings and accurate when timed consistently.

  67. Lawrence Vanderplas II (verified owner)

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    Chaszel makes excellent shotgun barrel adaptors and I’ve shot and loved a couple that I bought earlier. I’m sure this will be the same.

  68. William B. (verified owner)

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    Great adaptor shoots good at 50 yards with just a bead sight

  69. Jeff (verified owner)

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    As always a great product with an affordable price. I have bought several 9mm, 380, 38spl, 357, and the 45/410 inserts and happy with all of them and will by more in the future.

  70. STEAVE KANAVOS (verified owner)

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    Excellent products and service as always!!

  71. Anonymous (verified owner)

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    The machining work is spotless and very well finished, looking down the insert the rifling seems to be of good quality. The fit and finish are top notch and it fits snugly inside the 12 gauge barrel without rattling or getting stuck. Due to ammo shortages I have been unable to fire it with 357 mag ammo so I cannot speak to the accuracy.

  72. Greg Conn (verified owner)

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    This is the second adapter I have purchased from you guys. It is awesome. I really enjoy being able to use my shotgun for things other than shotshells. I’m hitting 4 inch group at 50 yards and I’m not a good shot. Looking forward to getting one more to complete my collection. Anyone that is looking for more utility out of their shotgun needs to start buying these. You can’t beat the price or the quality. And they shipped fast. Keep up the great work.

  73. Michael Packard (verified owner)

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    Awesome adapters very accurate

  74. Reuben D. (verified owner)

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    I’ve had a few adapters made by SL, but this .357 adapter is better. The black oxide finish makes it look like part of the gun, fits snug and stays put thanks to some partially inlaid rubber gaskets. It has a cut-out to allow the extractor to pop out without extracting the adapter, which I love, (but I can insert it upside down if I want it to extract every time.) Finally, it has two (count them, 2!) Finger nail recesses to pluck out spent casings. How luxurious. So now I’m certain to get the whole set, if they weren’t all out of stock of nearly everything…

  75. Jeffrey (verified owner)

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    Nicely made, work perfectly

  76. Peter W. (verified owner)

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  77. Eugene (verified owner)

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    Seems to fit well in a TRADITION 12 Ga. folder. Not had a chance to shoot yet.

  78. David Rickard (verified owner)

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    Now I have a 12ga AND a .357mag/.38 spl in one device! Happy, happy, happy!

  79. Jesse d. (verified owner)

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    Why not add variety to your single shotgun

  80. Jose Ramirez (verified owner)

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    Well made love it.

  81. Brian Blanchette sr (verified owner)

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    Good value for what it is.

  82. matthew green (verified owner)

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    great adapter just wish they made them in 28 inch length.

  83. Doug M. (verified owner)

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    You did great, product is awesome. Great company to work with.

  84. Robert Harwood (verified owner)

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    Awesome quality and accuracy. Great machining and finishing

  85. Jeffery F. (verified owner)

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    Perfect edition to my scavenger single shot set-up.

  86. John (verified owner)

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    Great, worked just fine in 1910 era spanish shotgun, BUT I will use ONLY .38 SP and NON +P to avoid any overpressure. SHOT VERY accurate both wad cutter and copper coated ball …Great job… I really wanted the 18 inch version but you were out. However the 5 inch accuracy is quite good. Thanks again for fantastic service and delivery…. John

  87. Nader (verified owner)

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    I received my product on time in a perfect condition but I did not get a chance to go out there and use it and shoot some round with it to see how is it doing but I really appreciate it thank you so much

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