Design 57 was created to be our first dedicated compensator, with five .125" holes over five slots, with the bottom slot left filled to prevent dust up while shooting prone. This version features a .468" through hole, to fit a variety of calibers, including 9 mm. The main body also tapers down to .75" to assist in weight reduction.
All devices come standard with a free black steel crush washer, but other locking options can be purchased to fit the build you're after.
MilSpec 416 Stainless, from a local supplier
.468" through hole, to fit calibers up to .430", including 9 mm
25 x .125" Compensating Vents