Heckler And Koch HK 416 / MR556 Tungsten Filled Recoil Buffer. Constructed from steel with a tungsten core, this factory original part from H&K is made in Germany and designed for HK HK416 and MR556 rifle models chambered in .223 Rem / 5.56x45mm as well as the AR-15 platform. The buffer sits within the buffer tube and compresses the recoil spring to mitigate recoil as the rifle is fired.
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