The AD-170S base is the shorter version of our AD-170 base. This base also fits the Atlas BT10-NC and BT10-LW17 Bipods **Will Not fit the B&T 5-H Bipod**. See B&T website for a modified 170S solution (ADM4103LA74: 5-H Lever). This mount will also fit the Magpul-17S Bipod. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock(tm) Lever system to accommodate both in spec and out of spec rail systems. Black in color. These are used in like new condition. Sold as is, no returns/exchanges, all sales final!