Otter Creek Labs OPS/AE P.T.B. Adapter Gen 2 - Raw Heat Treat

OPS/AE P.T.B. Adapter Gen 2 - Raw Heat Treat

The OPS/AE PTB (Past the Barrel) Adapter Gen 2 is a one-piece silencer mount engineered for use with OPS Inc. 12th Model, AEM5, and OCM5 suppressors. Designed to accommodate barrels that are not compatible with standard Over-the-Barrel (OTB) adapters—either due to oversized diameter or short exposed length—this unit enables solid mounting on a wide variety of .223/5.56 barrels threaded 1/2×28.

Crafted from H900 heat-treated 17-4 stainless steel, the Gen 2 PTB Adapter integrates rear wrench flats for easy install/removal and extends your suppressor’s placement 2.90" forward, aiding clearance and alignment.

One-Piece Steel Construction
Machined from H900-treated 17-4 stainless for exceptional strength

Past-the-Barrel Adapter Design
Solves compatibility issues with barrels over 0.75" OD or with less than 2.95" exposed barrel length

Adds 2.90” to System Length
Extends suppressor further forward from the muzzle

Rear Wrench Flats
Simplifies install/removal using a standard crescent wrench

Suppressor Compatibility:

OPS Inc 12th Model, AEM5, & OCM5

Thread Pattern
1/2×28 (standard AR-15 muzzle thread)

Made in the USA

Mounting Notes & Considerations

• Alignment Check Recommended – Always use an alignment rod prior to live firing to ensure concentricity, especially with tight bore suppressors
• Barrel Requirements:
  • 1/2×28 thread
  • Not compatible with barrels under 2.95" of exposed thread
  • Not intended for barrels under 0.75" outer diameter