OK hang with me but JG P90. It has metal internals except for the piston, it shoots fast(390) out of the box. It has 3 rails. Battery is upgradeable but stock one shoots fairly fast. Internals are upgradeable. Barrel is upgradeable. Their is an option for an M4 mag adaption or 300 rnd non wind hi-cap mags depends on what you prefer. It's got range(not a super long barrel but longer than most cqb guns) its short and easy to maneuver, making it good in case you run into close quarters situations and good all around so you can be fast and not have to swing a huge barrel around. Its ergonomic and fits good in your hands. Its unique. i've had mine for 3+ years and the only thing i had to replace was batt. and trigger contacts. Warning: after extended use (4+ years) your semi-full auto may blend together and you can lose semi auto capability-something to consider. Also, the front slide and rails are all full metal and the rest is polymer but with the gearbox it balances perfectly.