I'm wanting to do a Mk18 build but have a question. Will the barrel length be greater than 16.0" if I get the 10.3" DD Mk18 upper, add a Surefire SOCOM muzzle brake and a Surefire training suppressor. The training suppressor is 6.2", but I don't know how long it'd be once it's all together.
And, yes I will be permanently attaching the training suppressor to the barrel.

And, yes I will be permanently attaching the training suppressor to the barrel.


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