Long time shooter, new to AR's.
Been shopping for an AR15 and S&W's offerings.
I don't particular want the A-frame front sight and already have some Troy flip-ups.
I've noticed S&W's (and others) have various configs w/without that A-frame sight.
Is it common/easy to just switch out that sight and replace with a railed gas block? Is there any type of gas block I should avoid other than those who's rails are too low and don't match the upper's rail?
TIA