Lancer Tactical
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Lancer Tactical's Gen 4 NSR Complete Receiver Set is a polymer upper and lower assembly built for the M4 AEG platform. The pre-configured pair ensures proper alignment when you're repairing a worn gun or starting a fresh build. A full-length top Picatinny rail runs the length of the upper, giving you space to mount optics, red dots and other accessories. The polymer construction keeps weight down while holding up to regular use.