I'm starting this in 2 areas in hopes i can get to a wider audience..i bought this pws upper..the "PWS MK110 10.5" Mod1 223 Piston Upper" and put it on a mega arms lower..also using this surefire suppressor :SOCOM556-RC..after a hand full of shots using imi m855 ammo and the gas setting on #4, everything was fine, so then i take it to the away from home "shooting spot" with a few friends and we shoot it suppressed and not suppressed and i notice it starts acting funny..It starts to have kinda a "chunk,chunk" feel to it..like the buffer is kinda clunky or something..almost like a kinda drag on the system..it does eject and feed tho..so i bought a enhanced buffer tube from PWS and their heavy suppressor buffer,gave it a good cleaning,lubed it up and tried again..first couple of shots were fine..felt like a regular AR..then it started doing that "slide,clunk,slide,clunk stuff again..any ideas?