The BG-17 BATTLEGRIP is the big brother to the BG-16. The increased size and extended back strap & beavertail are tailored for larger-handed shooters. Excellent choice for .308/7.62mm rifles” the soft comfortable form sucks up recoil easily. Interior storage cavity allows storage of batteries” small partseven a complete M4 bolt assembly. BG-17 BATTLEGRIP fits all M4/ M16/ AR-15 type rifles & carbines” and MK16S/MK 17S/ AR-10/SR-25/MK11. Any weapon receiver configured to fit the M16/AR-15 type grip will also accept the BG-17.