The KWA LM4 Upper Receiver Top Rail assembly is a replacement optics mount rail for the KWA gas blowback M4. The upper rail can become bent or loose by over-tight application of out-of-spec optics, or by serious impact to a mounted scope.
KWA LM4 Part 111-5S is a drop-in replacement rail to repair any damaged LM4.
KWA LM4 Top Rail Assembly Part 111-5 Features:
-OEM Fit and Finish
-USA receiver fit ONLY, not for KSC M4