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AR15.COM
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4/30/2015 11:47:26 AM EDT
Carbine gas
.625 forward of the gas block journal.
Barrel length is irrelevant as it will be cut and pinned.
Under $150.

If not, it's going to be way cheaper to get an existing barrel reprofiled.
4/30/2015 12:11:48 PM EDT
[#1]
http://www.del-ton.com/DTI_Del_Ton_Inc_AR_15_16_Light_Weight_Pre_Ban_p/bl1051.htm

Doesn't specify gas block journal but fits the bill as long as you're cool with 1:9
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