i have had this weapon for more than a year now, its very durable and incredibly accurate. its the best shooting stock m4 ive ever used. after about 3 months i threw some upgrades on('*' indicates upgrades in performance): dbc 6.01mm m16 length tightbore*, madbull silencer barrel extension, echo 1 folding sights, NCSTAR 4x32 QD illuminated rangefinder sight or reflex sight (as needed) utg swatforce light, G&G vertical grip, and an intellect 9.6v 20000mah peq battery*. once i put in these upgrades it shot twice as far and twice as accurate. i had a legit airsoft DMR, as hard to come by as they are. if you are looking for a full metal high performance AEG, any KWA is the way to go. i have no doubt bout that. worth every last penny. the follwing pros and cons are based on the stock weapon.
-upgradeable (tho not needed)
-can support up to 11v lipos!
-CA/ECHO1/TM mag compatible
-great power, accuracy, and range
-certain externals will rust if not cleaned (shouldn't happen anyway because you all should be cleaning your weapons regularly anyway!!)
-cheap peq box (its the echo 1 version works perfectly fine, can be replaced)
Rating: [5 of 5 Stars!]