Hello,
After changing some parts around on a Service Rifle upper (taking the barrel and float tube off an A2 upper, and installing them on a A4 upper), I noticed a pretty fair gas leak around the FSB that wasn't there before we took everything apart. The A4 thing isn't quite working out the way I'd hoped, so the barrel and float tube are back on the A2 upper while I wait on a new WOA 20" Service Rifle tube. I cleaned up around the FSB pretty well while things were apart; haven't had a chance to fire it since, so I don't know if it's gonna leak again.
What would make this leak like it did? Just the FSB not lined up over the gas port, or what? The gun functioned fine, so I wasn't too worried, but I'd rather not have the gun leaking where it ain't supposed to!
TIA,
nuk