Originally Posted by RatDrall
If it functions with low powered ammo, it's over gassed, isn't it?
not necessarily--there should be a range that it functions with. I personally use mid length gas system on the 4 rifles I built, 16 in FN barrels with PWS 556 FH/comp ,Spike's tactical T-2 buffers, standard buffer spring- and it recoils really soft in my opinion.
The carbine gas system is supposed to have a higher gas impulse than the mid-length gas system. I had read on AR15 web forums that they can be overgassed, but I have only shot one carbine with carbine gas system. kick was a little harder, don't know specifics on the gun though (just shot one at the range).