Milled out buffer tube to show what the spring and buffer are doing at 1000FPS. 4 rounds in semi auto suppressed on a lead sled. 8″ CMMG RDB barrel and carrier. Modified 5.45 bolt is installed which has been modified for optimal use suppressed only.
147 Gr reloads, 556 Tubb Spring, A5 buffer tube, Kynshot RB5007
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