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Thread spacing question


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I've got a silencerco sparrow and am trying to put it on my Beretta arx .22 but have run into a small issue. I thought it would have traditional AR threading at .600 inches so I bought a .200 thread spacer. However, the threading on the ARX is apparently 1/4 of an inch to short with the spacer on so the sparrow doesn't tighten down all the way. But when I try it without the spacer in place the threads protrude 1/4 too far into the sparrow so I'm wondering which is the lesser evil until I can find a smaller spacer, leave a gap inside the sparrow and use the spacer or leave it off and let the threads protrude 1/4 of an inch inside the can? Would either of these two options pose any significant threat to a stainless steel can like the sparrow or am I overthinking this?
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Best to thread the can against a perpendicular shoulder on the barrel (or spacer if it's machined properly) rather than thread the end of the barrel against the inside of the can.  Otherwords, the barrel shouldn't bottom out in the suppressor, the can should lock against a shoulder machined behind the threads on the barrel.

 

I'm on your side of Oak Ridge (20 min up the road) if you want to swing by one day, I'd be happy to look at it for you.  PM me and I'll give you my info. 

Edited by LawEnforcementSalesTN
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