The B5 Systems Modular Platform Stock features an integral left-side folding steel hinge, adjustable length of pull, spring-assist cheekpiece, ambidextrous fixed and limited rotation quick disconnect sling mounts, and a nonslip buttpad. Attaches via 1913 Picatinny mount. Constructed of durable composite materials and steel hardware. Collapsible 2 1/4" Length of Pull Adjustment Adjustable Spring Assist Cheekpiece Adds 1/2" of Height. (To open, pull back and push up. To close pull back and push down) Integral Left-Side Folding Steel Hinge Cushioned Non-slip Buttpad Fixed Sling Mounts and Steel Anti-rotational QD Mounts Color-Matched Steel Hardware Attaches via 1913 Picatinny Mount Made in the USA Weight: 16.8 oz Length: 8.06 in Width: 1.76 in Height: 4.67 in