10.3-inch SBR on a BCM M4 Upper and PSA M4A1 Lower, Suppressed

The builder's first SBR and first can: a BCM M4 upper with a 10.3-inch Daniel Defense cold-hammer-forged barrel under a 9.3-inch Geissele MK8 rail, on a PSA M4A1 lower, suppressed with an Otter Creek Labs Polonium.