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Choate Tool Fab Arm +2 Shot Magazine Extension
As Low As $44.63 Save Up to 29%
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Fits STF 12

by J Case, Verified Owner from LA, United States Written on March 2, 2026
It's all the quality and value I expect of Choate products. I previously had a Briley extension advertised to fit the STF, and while it does, it didn't thread on all the way and left a wobble. This Choate 7 round extension fits perfectly on the FABARM STF 12. I can fit 6 rounds - just. The tube is 5 inches short of the breacher muzzle break if you keep yours installed. I may try to see if an 8 round tube will fit.
Pros:
  • value
  • Quality
  • fitment
  • easy to install
  • all components included
Cons:
  • Rough finish
Best Used for:
  • Defense and competition
Would recommend: Yes
Was it helpful to you? Yes | No

Great Accessory

by Greg, Verified Owner from ND, United States Written on April 10, 2024
The order arrived very fast with good communication along the way. Packaging was exceptional. The product was exactly as described. Contruction and design appears to be very good. Fit and finish is excellent. Even the barrel clamp had a matte finish. The price was exceptional. I highly recommend this product and Optics Planet
Pros:
  • value
  • Durability
  • cost
  • Fit and finish
Cons:
  • None
Best Used for:
  • Self and Home Defense
Would recommend: Yes
Was it helpful to you? Yes | No

Works but only gave me +1.

by Earthling, Verified Owner from LA, United States Written on December 4, 2022
I used this on a Tristar Cobra Force III and it fits fine after adjusting the threads on the shotgun (you have to remove some to get the spring and follower out). I used the included spring and follower and it only increased my capacity by +1. I got another follower that was shorter (the original would stick) but still only +1. It fits, looks good and is good quality but only 4 stars since I only went from 5+1 to 6+1.
Pros:
  • Looks good
  • works
Cons:
  • Only +1
Would recommend: Yes
Was it helpful to you? Yes | No
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