This allows for the mounting of a wide variety of rail mounted folding or detachable front sights. The main difference is that instead of having a fixed front sight, as is standard, a MIL-STD-1913 Picatinny rail that is placed at the same level as the receiver rail is used. Upon firing, the direct impingement gas system re-directs high pressure gas from the barrel back into the action of the weapon causing the bolt carrier group to cycle and allows for automatic or semi-automatic fire. piece of finely CNC sculpted steel replaces the front sight base of the M16/AR-15 series rifle and serves the same function in terms of the direct impingement gas system, but it also reverses decades of a flawed trend in the AR community. Precision machined from a solid billet of hardened 4140 alloy steel the WarBlock (Patent Pending) receiver level railed gas block is a true problem solver.
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