I am new to the AR-15 rifles and I just got one with a 20" stainless heavy barrel. I know with my sporter weight hunting rifles that I have to let the barrel cool down after a few shots but don't know about this heavy barrel. The barrel is a DPMS heavy stainless model and it has shot 5 shot groups very well but I don't know the rate at which I should fire it and then let it cool. Any suggestions or advice would be appreciated as I normally shoot rimfire and they just don't seem to heat up the barrel much.
Thanks.
