The Otter Creek Labs OCM5 and OCM6 rifle silencers are modern high performance reflex models sharing external aesthetic similarities with the historic OPS INC reflex silencers designed by the late Phil Seberger and manufactured by Ron Allen. Internally, the 5.56 mm bore OCM5 uses a highly efficient hybrid core design to provide extreme pure suppression performance, at the expense of higher back pressure. The 6 mm bore OCM6 uses a more modern Infinity core derivative and exhibits lower back pressure with a decrease in pure suppression performance compared to the OCM5. Both silencers may be easily mounted to standard AR-15 barrels using over-the-barrel (OTB) mounts from Otter Creek Labs, as long as there is adequate clearance aft of the barrel shoulder. These silencers provide “military clone” OPS INC silencer enthusiasts modern design options.

In this review, the Otter Creek Labs OCM5 and OCM6 performance metrics depend upon suppressing a supersonic centerfire rifle cartridge on a commonly fielded gas-operated rifle, which is an incredibly difficult task. How would the Otter Creek Labs OCM5 and OCM6 perform on your M4 with a 14.5-in barrel?