Кронштейн цевье для M16, M4 или AR15, четыре планки Weaver/Picatinny, CAA tactical X4MSD

Designed to exceed the newest requirements of the US Army for improving zero retention/repeatability. Upper three rail section mount underneath the end cap & secured in place with a friction fit ledge & roll pins. The receiver end secured with a barrel nut bracket that is attached to the upper three rail section with four captive flathead screws. The bottom rail is secure with friction fit ledge & with a retractable spring loaded piston. Four full length rails - top rail creates one long monolithic rail with the existing flat top rail. XM4S has two push button sling swivel mounting points at the front. XM4SD has four push button sling mounting points at the front and back. Slots around the rails provide maximum ventilation around the rails. CNC machined from aviation grade aluminum to MIL-1913 standards with a hard anodized black oxide finish for durability & ease of maintenance. Accepts grenade-launcher.