12ga to 357 back

357 12 Gauge Shotgun Adapters

(33 customer reviews)

$19.95$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.
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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"

33 reviews for 357 12 Gauge Shotgun Adapters

  1. 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.

  2. Terry L SMITH (verified owner)

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

  3. John B. (verified owner)

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

  4. STEAVE K. (verified owner)

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    Best Adapters in the market period!!

  5. STEAVE K. (verified owner)

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    Outstanding product!!

  6. 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

  7. David T. (verified owner)

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    Great quality and workmanship!

  8. Anonymous (verified owner)

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    Great product

  9. James A. (verified owner)

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    Wonderful product looking forward to deer season.

  10. Anonymous (verified owner)

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

  11. 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.

  12. Michael (verified owner)

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

  13. 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.

  14. William B. (verified owner)

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

  15. 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.

  16. STEAVE KANAVOS (verified owner)

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    Excellent products and service as always!!

  17. 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.

  18. 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.

  19. Michael Packard (verified owner)

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    Awesome adapters very accurate

  20. 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…

  21. Jeffrey (verified owner)

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    Nicely made, work perfectly

  22. Peter W. (verified owner)

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  23. Eugene (verified owner)

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

  24. David Rickard (verified owner)

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

  25. Jesse d. (verified owner)

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    Why not add variety to your single shotgun

  26. Jose Ramirez (verified owner)

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    Well made love it.

  27. Brian Blanchette sr (verified owner)

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    Good value for what it is.

  28. matthew green (verified owner)

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

  29. Doug M. (verified owner)

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

  30. Robert Harwood (verified owner)

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    Awesome quality and accuracy. Great machining and finishing

  31. Jeffery F. (verified owner)

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    Perfect edition to my scavenger single shot set-up.

  32. 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

  33. 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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