just wondering what the difference is in these barrels?
the first is a rra elite car a4:
http://www.rockriverarms.com/item-de...TOKEN=51827392
the second is a rra entry tactical:
http://www.rockriverarms.com/item-de...TOKEN=51827392
is the gas block covering the groove on the elite car or does the entry tac just have a different type of barrel? if so, what's the purpose of the groove? thanks.
- Jason
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