Features:

• Mark 4 tactical bases are the only bases to accommodate both the oversized #8-40 screw and a #6-48 screw, providing compatibility with the widest range of modern tactical firearms
• Both styles of screws are included with each Mark 4 base
• Securely attach your scope to any M16 variant with a carrying handle using this rugged mount
• Delivers rock solid stability for repeatable accuracy, use with Leupold QRW mounts
• Secure your mark 4 CQ/T scope to any picatinny style mounting rail using this specially designed mounting bracket
• Two rugged cross slot bolts secure the bracket for rock solid durability
• Mark 4 bases accept mark 4 rings, cross slot rings and QRW/PRW rings
• Get a precise and repeatable zero every time with this quick detaching mount for the Leupold Mark 4 CQ/T optical sight
• Fits all MIL-STD-1913/picatinny style rails
• System employs a slot and spline design and comes in 1-piece and 2-piece configurations