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Page AR-15 » AR Discussions
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Archived [ARCHIVED THREAD] - .625 or .750 Cross Bolt??
Posted: 12/3/2007 1:12:07 PM EDT
I'm buying a PRI Flip up front sight for my Rock River CAR A4 and I'm not sure which size I am supposed to get... Could some1 help me out here and explain what the 2 different sizes are? I have a standard barrell on my Rock River CAR A4, which Size do I use?
.625 or .750?
Link Posted: 12/3/2007 1:36:53 PM EDT
[#1]
Measure the diameter of your barrel at the location of the gas block.  That's the size PRI sight/gas block you need.

"Pencil" or lightweight barrels usually use the 0.625" block while "standard" barrels use the 0.750" block.

Link Posted: 12/4/2007 3:04:37 PM EDT
[#2]
Just what I wanted to hear. Thanks for the 411
Archived [ARCHIVED THREAD] - .625 or .750 Cross Bolt??
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