The 118 Compensator is a single port compensator designed for the Smith & Wesson M&P9 platform. It features a a single chamber (top port) and is generation specific. It is designed to work with the M&P9 3.6″, 4.25″ and 5″ models.

The Agency Arms 118 Single Port Compensator is threaded with the standard 1/2×28 thread pitch (Overall barrel protrusion should be 0.695″ +/- 0.005″ for optimal fitment). It features a single chamber design (1 Vertical Port). It is designed to utilize the OEM recoil spring assembly. Compatible with the M&P9 (3.6″, 4″, 4.25″ and 5″) platform. (NOT COMPATIBLE WITH CONVERSION BARRELS)

Compensator may require tuning of Recoil System. Designed to work with most factory loaded ammunition but will yield the best results with a heavier charged ammunition

The package includes:

118 Single Port Comp (Generation specific)

2 Set Screws with an Allen Wrench

Vial of Thread Locker


The Gray and Gold finishes are anodized and are not an exact match to our barrels. Disclaimer : Color of the actual product may vary from the image.

** These compensators are designed to fit best with Agency Arms barrels, some aftermarket barrels have different standoff distances which can cause a gap between the compensator and slide**


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