Quote:
Originally Posted by BlueSkyJaunte
Yes, but unless you're building your own upper, you don't need to worry about that. I would guess the vast number of barrels sold have already been assembled into an upper.
Besides, it's easy to find another gas block from any number of sources if you happen to have purchased the wrong size.
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Well it's something to lookout for if you wanna replace the one on yer upper with one you buy online.. Better to measure before you end up with the wrong piece..
Most will be standard, but some aren't.. Takes 5 seconds to measure.