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Old 07-17-2013, 2:13 PM
dragon7 dragon7 is offline
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Default Cross pinning AR gas block

Do I really need to cross pin my AR gas block? I see many AR builders recommend it. Is it just overkill? My other ARs have set screwed gas blocks that have never come loose. I understand in military arms it would be desireable. Does the military actually cross pin their gas blocks?
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Old 07-17-2013, 3:22 PM
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ar15barrels ar15barrels is offline
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The military SPR's and M110's have cross pinned gas blocks.
There are no other AR family military rifles that use simple gas blocks.
ALL front sight bases on M16s through the M4 family have cross-pinned front sight bases.
Cross pinning a simple setscrew-attached gas block is not really needed IF the setscrew is set into a detent on the barrel.
If you do NOT have a detent for the setscrew, I recommend making a detent at the minimum.
Clamp-on gas blocks don't need a detent as they have more holding power than a setscrew-attached gas block.
Randall Rausch

AR work:
Bolt actions:
Foreign Semi Autos:
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
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Old 07-17-2013, 11:01 PM
dragon7 dragon7 is offline
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Randall to the rescue again. I really wanted the experience of building my first upper but I've been sorely tempted to just package all my parts up and Fed Ex it to Randall where I know it would be done right.
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