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Reviews & Ratings for Choate Tool Stevens 320 Magazine Extension Matte — 21 reviews

(21 reviews)
Choate Tool Stevens 320 Magazine Extension Matte
Choate Tool Stevens 320 Magazine Extension Matte
As Low As $59.99 Save Up to 17%
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Most Helpful Positive Review A minor modification is needed to your Stevens 320
I purchased this item through OP's GunBroker site. It arrived quickly and in great shape. The extension screws perfectly onto my Stevens 320 magazine's threads and the included spring seems appropriate. One thing I would note is that after installation, the Stevens factory shell follower tends to h...
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Most Helpful Negative Review Doesn’t fit
I have a 2019 Stevens 320 and this does not fit. The diameter is right but as soon as the thread starts it locks up. Had it looked at and the threads do not match. Don’t buy this product for the Stevens 320.
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Stevens 320 magazine tube extension

by Tim, Verified Owner from OH, United States Written on December 6, 2025
Works great, easy install after removing the magazine tube dimples.
Would recommend: Yes
Was it helpful to you? Yes | No
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Shell extension

by Patriot, Verified Owner from CA, United States Written on September 13, 2025
Looks pretty cool only holds 1 shell.. provides room for a shotgun flashlight attachment between tube extension and barrel.
Would recommend: Yes
Was it helpful to you? Yes | No
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Stevens 320 mag.tube extension

by Booger, Verified Owner from LA, United States Written on September 12, 2025
Perfect fit. I bought the +1 extension but it holds 2 extra when you remove the unnecessary plug from under the spring keeper.
Would recommend: Yes
Was it helpful to you? Yes | No
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One note on these for those not getting full amount of rounds

by Frank, Verified Owner from GA, United States Written on July 5, 2025
The included spring is not cut to size you must trim it yourself a good starting point is 12 to 14 inches longer than the installed extension if needed after trim an inch to inch and a half at a time till you have your proper round count
Would recommend: Yes
Was it helpful to you? Yes | No
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Perfect addition to my 320 Security

by Frank, Verified Owner from GA, United States Written on July 4, 2025
Good quality and a perfect fit used a defender tactical detent removal tool trimmed the spring and added the extension ran several tests using B's dummy rnds perfect no issues my 320 is now 6 +1 capacity
Would recommend: Yes
Was it helpful to you? Yes | No
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Wish it could work.

by Jay, Verified Owner from TN, United States Written on April 18, 2025
In stalled + 2 extension and could only get one extra round in tube. Everything fit and assembled fine. Tried several times to shove second extra round in with no luck.
Pros:
  • Looks good
Cons:
  • Only one round
Best Used for:
  • Home Defense
Would recommend: No
Was it helpful to you? Yes | No
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Perfect fit for my 18” barrel 320!

by Logan, Verified Owner from TX, United States Written on March 11, 2025
The +1 extension fit perfectly flush with the end of the 18” 320 barrel, but that’s not the best part…. After removing the mag tube dimples, and installing the +1 extension, my mag tube capacity went from 5 to 7!!! It actually gave me +2 capacity with 2 3/4” shells!!
Would recommend: Yes
1 of 1 found the following review helpful.
Was it helpful to you? Yes | No
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Choate +1 320 20 gauge

by MutilatedWalker, Verified Owner from UT, United States Written on February 12, 2025
Installed this on my Stevens 320 in 20 gauge (new version made after 2019). I did have to drill out the dimples on the end of the existing tube. The barrel collar covers the holes in the magazine tube so no big deal. The +1 aligns great with the 18.5" barrel.The screw on the barrel clamp extends a little too far but nothing a hacksaw can't fix.
Would recommend: Yes
1 of 1 found the following review helpful.
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2 XTRA ROUNDS

by Mike H, Verified Owner from MA, United States Written on November 29, 2024
2 extra rounds in under 2 minutes. It took longer to add a sling. I bought two of these to put on pistol grip shotguns that I gave to my sister's for Christmas. Biden did that.
Pros:
  • Quick shipping and well packaged
  • Quick & Easy
  • Had a coupon
Cons:
  • None
Best Used for:
  • Street sweeping
Would recommend: Yes
2 of 3 found the following review helpful.
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extension tube

by Anonymous, from MA, United States Written on November 27, 2024
This extension tube fits perfectly! Took out the plug and the old spring replaced it with the new spring went to the range the following day cycle 10 rounds through it and fired it no problems.!!
Would recommend: Yes
1 of 1 found the following review helpful.
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