it's pretty well my teams standard weapon, so I'll fill you in, and the review is the same for every G&P:
simply said, upon arrival it needs to go to a gunsmith to get it's internals shimmed (VERY MANDATORY), and possibly align anything that may be installed off-center (barrel, RIS). And all the G&P armalite I've seen so far don't come with that miracle spring on their hopup unit, meaning the hopup unit isn't always pressed against the mechbox so your hopup is on/off all the time.
Other than that, they're certainly the sturdiest AEG I've held so far (second only to systema), and have the best RIS systems by far. The internals are reliable (very good piston) and should last you a long time as long as you get those gears shimmed before you use them!
Overall it makes a great veteran airsoft gun, in the fact it's an amazing and affordable metal body to house all your awesome internal upgrades you'll eventually put in
