MAGPUL 6.8 MM MAGAZINES WILL ONLY FUNCTION IN THE NEW LWRC SIX8 MODEL RIFLES. THEY WILL NOT FUNCTION IN OLDER 6.8MM RIFLES OR ANY OTHER MANUFACTURER'S RIFLES. Impact and crush resistant construction incorporates new M3 polymer technology and manufacturing processes for enhanced strength, durability, and reliability to exceed rigorous military performance specifications. Over-insertion stop on the spine helps ensure that the magazine will not over-insert on compatible weapons. USGI-spec stainless steel spring for corrosion resistance and field compatibility. Aggressive non slip texture at the front and rear for superior grip. Paint pen dot matrix to increase durab Mfg: Lwrc International