Originally Posted by Volucris
If you buy a proper m16/m4 upper with m16 bcg and oil it you'll never have problems with a DI gun....Your barrel will be useless before the carbon fouling in a DI gun can start causing any problems....
not true at all especially the second statement i quoted... i've had to clean AR's that were so fouled with carbon you couldn't cylce the action with out major force and the bolt would close upon releasing the charging handle. it took 6 hours to clean... 6 HOURS! then add in the corrosion that was eatting the bolt. broken gas rings suck.
not advocating DI or Piston either way, just saying
EDIT: i should say that either system NEEDS to be maintained properly and cleaned correctly