thanks for the pep talk, I just ordered mine off wgc, hopefully I'll be lucky and not get a lemon, regarding upgrades/spare parts, from what I managed to find out from G&G, I've asked them about the l85 so it's the same thing, google searches and the like, I've found out that the hop-up like any m16/m4 hop-up, the barrel is 500-ish mm, redwolf has the spacer upgrade w/wo the sector gear, G&G makes a reinforced piston head, they say that they make a reinforced piston G-10-056, this one, however the pic on the website looks like any other 16 teeth piston, the person I talked to, assured