Otter Creek Labs OCM6

Otter Creek Labs OCM6 Details

The Otter Creek Labs OCM6 is a full-auto rated 5.56 reflex suppressor built around a DMLS 3D-printed 718 Inconel baffle core with a 6mm bore. It measures 8.8 inches in overall length, weighs 16 oz, and has a 1.5-inch outer diameter. Because the reflex body extends back over the barrel, the OCM6 adds far less length in front of the muzzle than its dimensions suggest. It mounts via Otter Creek Labs' PTB and OTB systems and is compatible with legacy OPS Inc and Allen Engineering pattern mounts (mounts sold separately), and it is available in Black.

What Makes the OCM6 Different

The OCM5 earned its reputation as one of the quietest 5.56 suppressors ever measured at the muzzle — and, like every classic Ops Inc-style reflex, it was pretty high backpressure. The OCM6 is Otter Creek Labs' answer. Its Inconel core is a modified Infinity-derivative design with eight distal vents that meter combustion gas forward and out of the suppressor instead of back through your receiver. The OCL OCM6 has brought the classic reflex design into the modern era using advanced technologies to propel performance to a new tier.

Features and Benefits

• DMLS 3D-printed 718 Inconel baffle core — the same superalloy used in jet engines outlasts stainless steel under sustained heat and pressure, and additive manufacturing allows internal geometry a lathe can't cut
• Eight distal vents for low back pressure — gas is metered forward and out of the can, dramatically reducing blowback at the shooter's ear and blast at the ejection port compared to the OCM5
• Classic reflex profile — the Ops Inc 12th Model silhouette Mk12 and SPR cloners want, with 21st-century internals
• Over-the-barrel design — 8.8 inches of suppressor with far less added length at the muzzle, keeping the rifle balanced and maneuverable
• Full-auto rated — built for demanding firing schedules, with barrel-length guidance below
• 6mm bore — efficient on 5.56 NATO as well as 6ARC, 6 Creedmoor, and more.
• Broad mount compatibility — runs on Otter Creek Labs PTB and OTB mounts as well as legacy OPS Inc and Allen Engineering pattern systems already on your build

Mounting System

The OCM6 does not ship with a mount. Choose the system that fits your barrel:

PTB (Past the Barrel):

For barrels over 0.75 inch in diameter or without enough exposed barrel for a collar, the PTB adapter threads on at 1/2x28 and positions the suppressor forward of the barrel. Minimum barrel length: 10.3 inches.

OTB (Over the Barrel):

The traditional reflex configuration, clamping over the barrel Ops Inc-style for maximum length savings. Minimum barrel length: 11.5 inches; on barrels under 12.5 inches, Otter Creek Labs recommends a more conservative full-auto firing schedule.

Already running an OPS Inc 12th Model, AEM5, or OCM5? The OCM6 is compatible with OPS Inc and Allen Engineering pattern mounts, so it can drop onto hosts you've already set up.

Who the OCM6 Is Best For

The OCM6 is for shooters who live behind a suppressed AR: Mk12 and SPR cloners who want the correct silhouette without the legacy gas problem, high-volume carbine shooters tired of eating blowback, and anyone running short-stroke or unadjustable gas systems where a high back pressure can cause over-gassing. 

What's in the Box

• Otter Creek Labs OCM6 suppressor
• Mounts sold separately — PTB and OTB systems available

Specifications

• Caliber Compatibility: 6mm cartridges, 5.56 NATO, .223 Remington
• Bore: 6mm
• Overall Length: 8.8 in
• Added Length: 6.2 in
• Reflex Length: 2.6 in
• Weight: 16 oz
• Construction: Hybrid
  • Core Material: DMLS 3D-Printed 718 Inconel
  • Outer Tube Material: Machined Titanium
• Mount Compatibility: OPS 12 / AEM5, OTB, MWA, PTB

FAQ

What calibers is the Otter Creek Labs OCM6 rated for?

The OCM6 is rated for 5.56 NATO and .223 Rem, as well as 6mm cartridges such as 6ARC. 

What mounting systems are compatible with the Otter Creek Labs OCM6?

The OCM6 runs on Otter Creek Labs' PTB (past-the-barrel) and OTB (over-the-barrel) mounting systems, both sold separately, and is compatible with legacy OPS Inc and Allen Engineering pattern mounts. Minimum barrel length is 10.3 inches with the PTB mount and 11.5 inches with the OTB mount.

How quiet is the Otter Creek Labs OCM6?

In independent PEW Science testing on a 14.5-inch M4A1 (SSS.6.213), the OCM6 earned a muzzle Suppression Rating of 34.1 and outperformed the OCM5 at the shooter's ear — where you actually hear the gun. It trades some downrange suppression for dramatically lower back pressure and port blast.

Is the Otter Creek Labs OCM6 full-auto rated?

Yes. The DMLS-printed 718 Inconel core is built for sustained fire. On barrels under 12.5 inches with the OTB mount, Otter Creek Labs recommends a more conservative full-auto firing schedule.

How does the Otter Creek Labs OCM6 compare to the OCM5?

The OCM5 is the raw-suppression specialist: a straight-cone hybrid that ranks among the quietest 5.56 cans PEW Science has ever tested at the muzzle, at the cost of high back pressure. The OCM6's vented core flips that trade — significantly less gas blowback and ejection-port blast, better at-ear performance, and a modest step down in muzzle suppression. Both share the same reflex profile and mount ecosystem.

Will the Otter Creek Labs OCM6 fit my Mk12 clone?

Yes — that's the point. The OCM6 carries the Ops Inc 12th Model lineage and runs on OPS Inc / Allen Engineering pattern mounts, making it at home on Mk12 and SPR clone builds while adding modern low back pressure internals.

What is the Otter Creek Labs OCM6 made of?

The baffle core is 718 Inconel, DMLS 3D-printed as a modified Infinity-derivative stack with eight distal vents. Inconel is a nickel-chromium superalloy that holds its strength at temperatures that erode stainless steel.

What is the warranty on the Otter Creek Labs OCM6?

Otter Creek Labs has one of the best warranties in the industry; you're covered by a no-questions-asked lifetime warranty.