i have the new Bolt Heavy Recoil B.R.S.S. (B.R.S.S. Heavy)M16A4 and i have mixed results and feelings, initially i had lots of trouble misfiring and inaccuracy with bb's going everywhere, i was boxing it to return and and another fella took barrel out and spent next hour cleaning incredible amounts of wax out of barrel, after putting it back into gun, it fired a hell of alot better, i still have misfiring, not as bad but it remains, i find that if i pull magazine back whilst shooting it misfires a lot less, also you have to keep tightening the odd screw as the recoil is powerful, i think these are the flaws with what is a great gun that has most realistic recoil yet, im going to try to find bb's that are 5.90. not 5.95 as the barrell is true 6 mm, which im hoping helps aswell