I am planning a fun project and I have a question. I am building a 11.5 inch barrel AR15 5.56 with a pistol length gas system, adjustable gas block, and a suppressor. the suppressor is an older Ceiner that sleeves the barrel 5" from the muzzle, so that's why the pistol length gas system. my question is, will the gun experience increased gas fouling or unburnt powder in the gas tube due to the short gas tube and the added back pressure of the suppressor relative to the short barrel? is there a potential reliability issue beyond the other factors of mechanics? and if it looks like I might, what would be a recommended powder or loaded ammunition that would help mitigate the fouling? Thanks.