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First Factory Next Gen M4 Hard Buffer Ring

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The recoil of the Next Gen M4 and HK416 series accumulates stress on the buffer ring or castle nut causing it loosen and unthread. Although tightening the nut is a temporary remedy, once the part begins to deform the wear will accelerate eventually become unusable.

This First Factory replacement is made of tough chrome molybdenum steel making it highly durable against shock, deformation and warping.