Sig Sauer GRIPMODXCA943LGBLK P320 Grip Module X-Series Carry (Large Size Module), 9mm Luger/40 S&W/357 Sig, Black Poly, Fits Sig P320 (3.90 & 4.70), Frame

(Magwell & Weight Compatible) Install your P320 firing control unit into this Grip Module Assembly to convert to a P320 XSERIESCarry chambered in 9mm, .357 SIG, .40AUTO with your selected grip size. Requires the 9mm, .357 SIG and .40AUTO slide and barrel. Please Note - The XSERIES Grip Modules will not work with magazines that have "SIG SAUER" on the baseplate. They are compatible with the baseplates that have the SIG Mark on it.