The Otter Creek Labs M4 Collar is a precision alignment device designed to ensure proper suppressor installation and prevent baffle strikes on AR-15 and M4 platform rifles.
- Type: Suppressor alignment collar / thread protector
- Thread Pitch: 1/2×28 TPI
- Material: Steel
- Finish: Black
- Compatible Firearms: AR-15, M4, and other rifles with 1/2×28 TPI threaded barrels
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