Quote History Originally Posted By captexas:
Factory barrels yes. If keeping the factory barrel some of the suppressor companies make hubs/mounts with different thread pitches including the left hand pitch on these.
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But beware - all 13.5x1 mounts are not the same.
Some shoulder on the taper, some require a taper adaptor to make a perpendicular shoulder on the taper, and some shoulder on the muzzle of the barrel.
I would recommend you avoid the taper adaptor, I've never seen good results with those on the 13.5x1 threads.
The threads are designed to shoulder on the muzzle because they were designed for semi-auto pistols where the barrel was very close to 13.5mm OD.
Additionally, the cylindrical surface ahead of the threads is there to provide a smooth surface for an o-ring to seal the mount to the barrel.
Ecco machine makes a silencerco alpha mount that shoulders on the muzzle. If you need an alpha style mount I would recommend it.