here's mine, it's base equipment is an echo 1 para m249 but most of that is gone now
internally it's got bearings, torque up gears, amp motor, 130 spring, upgraded nozzle, new piston & head,
and a new hop up unit and bucking .
externally a lot of weight has been cut out, dumped the bi pod, replaced the POS box mag with a mag brand
model that's wired to the trigger, has a slip on houge grip, it's been repainted in a simple flat black/OD scheme.
the boys at AT did a great job on the work, I took it to OPI-VII last year after the upgrades and barely squeezed it
thru the chrono station. the chrono judge had two other chrono judges come over for a meeting on this one.
it's not the prettiest 249 out there but it spits out plastic death at a furious rate