I have 2 5.45 guns I sbr'ed.
I left enough barrel to crown and thread in 1/2 x 28 so I can use ar15 muzzle devices on them.
The nub on this one fits right inside the traditional one. So depending on the device it can go either way.
Attached FileThis one the nub is too long and hasn't been cut down yet since I have not decided what's going there permanently. It's got a fake suppressor as a thread protector at the moment. But the lantac dragon in my bits box looks sexy too.
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