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My first AR

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My first AR
VASCAR2 Offline
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#25
01-18-2018, 02:42 AM (This post was last modified: 01-18-2018, 02:46 AM by VASCAR2.)
The 223/5.56 bolts use .125 bolt face +or- .001. When Colt designed and released an AR-15 chambered in 7.62X39 their research noted the difference in the rim thickness between 223/5.56 and X39 case. Colt Engineers used a .136 bolt face depth for the 7.62X39 cartridge. The deeper bolt face allows more room for the extractor for the larger X39 case. Bill Alexander looked at Colts design and saw the benefit of the .136 bolt and used it with 6.5 Grendel which is the same case head as the 7.62X39.

Recent manufactures of 7.62X39 AR-15’s did not use the .136 bolt face depth and went with the .125 bolt face depth used with 223/5.56 bolts.
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Messages In This Thread
My first AR - by Alex984 - 01-09-2018, 01:39 AM
My first AR - by Texas - 01-09-2018, 03:10 AM
My first AR - by Redomen - 01-09-2018, 03:15 AM
My first AR - by zcostilla - 01-09-2018, 03:24 AM
My first AR - by Kswhitetails - 01-09-2018, 06:22 AM
My first AR - by Sticks - 01-09-2018, 10:36 AM
My first AR - by just_john - 01-09-2018, 12:34 PM
My first AR - by Sean Boburk - 01-09-2018, 01:22 PM
My first AR - by zcostilla - 01-09-2018, 03:20 PM
My first AR - by Randy99CL - 01-09-2018, 06:27 PM
My first AR - by Sean Boburk - 01-09-2018, 08:37 PM
My first AR - by zcostilla - 01-09-2018, 09:22 PM
My first AR - by Lastrites - 01-09-2018, 10:21 PM
My first AR - by Sean Boburk - 01-09-2018, 11:59 PM
My first AR - by Dcommoncents - 01-10-2018, 12:16 AM
My first AR - by Alex984 - 01-10-2018, 12:35 AM
My first AR - by Drillboss - 01-10-2018, 12:49 AM
My first AR - by zcostilla - 01-10-2018, 05:45 AM
My first AR - by Randy99CL - 01-10-2018, 07:49 AM
My first AR - by Lastrites - 01-10-2018, 12:32 PM
My first AR - by howl - 01-10-2018, 12:57 PM
My first AR - by Dcommoncents - 01-10-2018, 02:28 PM
My first AR - by bj139 - 01-17-2018, 11:51 PM
My first AR - by Dcommoncents - 01-18-2018, 01:08 AM
My first AR - by VASCAR2 - 01-18-2018, 02:42 AM
My first AR - by bj139 - 01-18-2018, 03:25 AM
My first AR - by Dcommoncents - 01-18-2018, 04:17 AM
My first AR - by Dcommoncents - 01-18-2018, 04:26 AM
My first AR - by Timmy2Knives - 01-19-2018, 02:32 PM

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