Gun Guardian Multi-Functioning AR-15/M4/M16 AR Grip Blue. It makes concealing carrying and transporting the firearm much easier and when used properly a little safer. With that being said the Multi-Functioning Grip is NOT a firearm safety device. NOT a CA Compliant Grip. Fits most AR-15 style rifles/pistols with a flat to moderate drop-down trigger guard (see photo above). The Shield will not slide over the trigger if your lower receiver has a ''Winter'' or extreme drop-down trigger guard. The Multi-Functioning Grip is designed for hard-use firearms not ''Safe-Queens''. Due to the tight tolerance the Multi-Functioning Grip may wear the firearm finish near and around the trigger area. See the photograph with the red arrow which is our demo rifle with thousands of cycles through it. Specifications for Gun Guardian Multi-Functioning AR-15/M4/M16 AR Grip: Manufacturer: Gun Guardian Gun Make: AR Platform Gun Type: Rifle Gun Model: M16 M4 AR-15 Material: Polymer Mount: Screw Package Contents: Gun Guardian Multi-Functioning AR-15/M4/M16 AR Grip 3 Backstraps Screw What firearm models does the manufacturer say Gun Guardian Multi-Functioning AR-15/M4/M16 AR Grip is compatible with? The manufacturer says that Gun Guardian Multi-Functioning AR-15/M4/M16 AR Grip is compatible with AR-15 M4 M16Gun Guardian GG-MFGRIP-BLU: Multi-Functioning AR-15/M4/M16 AR Grip Blue