The ERGO 2 AR Pistol Grip with Suregrip, is uniquely designed to allow installation on both .556 and .308 AR/M4 lower receivers without a need for spacer inserts. A traditional A2 sized inner cavity is compatible with many accessories available on the market. The ergonomically correct finger grooves provide a sure purchase under even the most extreme conditions.Features :Design allows installation on both .223 and .308 AR-15/AR-10 type receiversErgonomically correct finger groovesComes with The Gapper