This Sig Sauer P320 X-Series Full Size Grip Module is a premium factory upgrade finished in a black polymer for Fire Control Units without a manual safety. It features the signature X-Series ergonomics, including a deep trigger guard undercut and an extended beavertail, which allow for a higher grip and improved recoil management. The "Medium" circumference "Full Size" frame is optimized for 9mm, .40 S & W, and .357 SIG setups, specifically fitting full-length 4.7-inch slides and providing maximum magazine capacity. This assembly comes ready for installation with a pre-installed, reversible magazine catch and is compatible with internal tungsten weights for added balance. Sig Sauer P320 X-Series 9/40/357 Full Size Medium Black Pistol Grip Module Assembly GRIP-MODX-F-943-M-BLK