Linky link.
1913 rail top, USGI contract M4 marking and M4 feed ramps. They are also hard-coat annodized to MIL-A-8625 type III class 2 and Dry-Film Lubed with machined and painted T-slot marked positions. Each upper was precision machined to mil-spec from a 7075 T6 aluminum forging.
Can't go wrong at $39
1913 rail top, USGI contract M4 marking and M4 feed ramps. They are also hard-coat annodized to MIL-A-8625 type III class 2 and Dry-Film Lubed with machined and painted T-slot marked positions. Each upper was precision machined to mil-spec from a 7075 T6 aluminum forging.
Can't go wrong at $39