The BT17 – 4″ 1913 Picatinny Rail will accommodate hole patterns with a center to center spacing of 2.2 – 3.5″ with a FLAT back to accommodate flat surfaces. It also has a flush cup allowing the use of Flush Cup sling swivels and sling studs (neither provided).
Machined to Picatinny rail standards from 6061-T6 aluminum with Mil-Spec Type III Class 2 finish. Available in black only.
Weight: 1.20 ounces