<p>Familiar Handling, Unfamiliar Power, SIG SAUER has taken the proven features of the SIG516â„¢ and applied them into a potent AR-based rifle chambered in 7.62 x 51mm. Utilizing the short stroke pushrod operating system, an M1913 Mil-Std rail, free-floating barrel, aluminum forend, telescoping stock, and Magpul PMAG, the SIG716 is the rifle of choice when you require the power of a larger caliber carbine Item Number R716-H18B-DMR Action Semi-Auto Operating System Short stroke pushrod operating system with 4 position gas valve Caliber 7.62 X 51 mm NATO Overall Length 38.25 in Trigger Type 2-Stage Match Trigger Weight 6.5 lbs Barrel Length 18.0 in Rifling 1 i” Number of grooves 6 Weight w/out Mag 12.3 lbs Mag Capacity 20 Rounds Mag Type Magpul PMAG Accessory Rail Yes Features Short stroke pushrod operating system, Match grade trigger group, Magpul PRS Stock and MIAD Grip</p>