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Agency Arms Sig Sauer P320 9mm +5 Pistol Magazine Extension
As Low As $81.99
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Agency Arms vs. Springer Precision

by Jake De Muss, Verified Owner from New Zealand Written on December 25, 2025
I have both and prefer the Springer Precision much better. The Springer Precision is quick and simple to install, the set screw is in the ideal location, it cost less, and it doesn't rattle compared to the Agency Arms.

The Agency Arms is difficult to install because the spring on the base pad side isn't wound 360 degrees at the end. I know this for a fact because I compared it to the Springer Precision spring. When you try to slide the base pad over the Agency Arms spring, it will pop back out and if you're not careful, the sharp end of the spring will get hung up on the base pad and tear up the anodized finish.

Also, the set screw is poorly design and makes the magazine rattle. Not worth the price unless you must have an Agency Arms base pad. There are better quality options out there at a lower price.
Pros:
  • Looks nice
Cons:
  • Expensive
  • PITA to install
Best Used for:
  • Angency Arms P320 Pistol
Would recommend: No
Was it helpful to you? Yes | No

Agency Arms vs. Springer Precision

by Jake De Muss, Verified Owner from New Zealand Written on December 25, 2025
I have both and prefer the Springer Precision much better. The Springer Precision is quick and simple to install, the set screw is in the ideal location, it cost less, and it doesn't rattle compared to the Agency Arms.

The Agency Arms is difficult to install because the spring on the base pad side isn't wound 360 degrees at the end. I know this for a fact because I compared it to the Springer Precision spring. When you try to slide the base pad over the Agency Arms spring, it will pop back out and if you're not careful, the sharp end of the spring will get hung up on the base pad and tear up the anodized finish.

Also, the set screw is poorly design and makes the magazine rattle. Not worth the price unless you must have an Agency Arms base pad. There are better quality options out there at a lower price.
Pros:
  • Looks nice
Cons:
  • Expensive
  • PITA to install
Best Used for:
  • Angency Arms P320 Pistol
Would recommend: No
Was it helpful to you? Yes | No

ehhh. just ok

by CedarOats, from FL, United States Written on March 24, 2025
These look cool and I love the anodized green BUT wow what a pain to install. Had to file down the tabs on the magazine to get this to slide on and then press in the center so the locking set screw could even go in. May just throw these away when the magazines need cleaning, it was that much of a pain.

Other than that, they’re great. Easy to grab and look great with my gun build.
Would recommend: No
Was it helpful to you? Yes | No
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