The 7×7 Collars are a new take on an old Allen Engineering product. Formerly known as the M4 Collar, we renamed it to avoid confusion with the M4 suppressors which they are not compatible. The name “7×7″ comes from the step the collar sits on. The step is roughly .700″ past the shoulder and the diameter of the barrel between the shoulder and the step is also around .700”. This is an extremely common step among a variety of barrels which makes these collars a versatile option.
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