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AR15.COM
3/20/2017 7:29:15 PM EDT
Odd question, for continuity between my threaded 9mm pistols and a 9mm AR I'm building, I'm considering re-threading the barrel from 1/2 x 36 to 1/2 x 28 so I don't have to change out pistons between weapons. The potential dilemma is the barrel is a JP 10.5" and the rail is a SLR 7.25", I was wondering if there is enough barrel length to cut and re-thread?

I haven't received the barrel yet so I haven't been able to mock it up, and admittedly I'm not 100% on 9mm AR barrel sizing, but I do know it's not measured the same as 5.56 barrels and runs a bit shorter.

Thanks!
3/20/2017 8:58:21 PM EDT
[#1]
The 10.5" probably has .600 long threads. We can chop them off and re thread only .400
3/20/2017 10:02:32 PM EDT
[#2]
Would that be an adequate thread depth for indexing an Osprey .45 and would that leave enough room between the rail and the threading?

Sorry for the barrage of questions, just kinda wish I got a 7" rail at this point
3/26/2017 1:39:53 PM EDT
[#3]
Yes, .400'' is the spec length for pistol caliber can.
3/29/2017 6:31:17 PM EDT
[#4]
Great. Ordered placed and en route!