I'll look for Pauly and port gauges. Might knock the gas block off it anyway just to make damn sure that last little bit of gas port isn't blocked and use a drill bit to check sizes.
As for the bolt polish is that going to make a huge difference in cycling? A lot of what I see here looks to be a bit much...
Thanks, at least I'm on the right track. I'm still wondering what the bolt polish has to do with cycling. Is there that much internal friction in these guns? And if internal friction is adding enough resistance to the equation why would you say the low tension spring won't help?