M18 Caliber X-Change Kit, 3.9" configuration. This Caliber X-Change Kit requires a Manual Safety (Thumb) to Function, for this is the Original USMC Contract Grip Module and Complete Slide. This kit is a Sig Sauer P320-M18 with the M18 FCU removed. 

This kit converts a P320 to manual safety version of the renowned M18.
The M18 was recently issued to all branches of the U.S. Military and was chosen as the official sidearm of the U.S. Marine Corps. The P320-M18 is the commercial version that brings the same unprecedented accuracy, extreme reliability and unmatched durability the military demands.

(1) Complete Slide w/ X-Ray 3 Night Sights
(1) Grip Module
(1) 21rd Magazine

****Sig Sauer M18 hard case available for $20.00 

*Note, only for use on 9mm/ .357SIG / .40S&W firing control units (FCU). It will not function with a .45 ACP FCU.