G&P Complete M4 Metal Receiver & Gearbox Airsoft AEG ProKit (G&P USA) Front Wire / Black

"Great deal, I used the gearbox to install a dsg, and swapped out the piston, trigger set, spring, and gears, all else is stock. Very high quality body, as to be expected from G&P, and cheaper than buying them seperately

"I bought this receiver in hopes of rebirthing my broken m4 viper from Walmart. What I did was attach it to the barrel and stock and it worked like a charm. Though, when I was opening it, I found that the grip was polymer, not metal. To answer a FAQ, no it does not come with a hop-up. I had to exchange air nozzles from my old m4 for my old hop-up to fit.

Pros:
High ROF
great looks
Fully customizable
Easily dissembled for us Air-smiths out there

Cons:
Polymer grip
No hop-up
Sometimes needs to be modified

"A friend of mine recommended this set, and I am very glad I followed his lead. The only modification to the gearbox being a new piston, with the G&P "rapid-fire" front-end kit I have a nice aeg that performs flawlessly. Thank you evike for making these available!

"I have run this kit for a few years and it has been great for me so far.
pros
quality upper and lower
solid gearbox
fps
weight

cons
By far my biggest gripe is that the rear pin in the receiver does not line up correctly with the gear box. Mine is also not the only one that is like this.
motor

"Just straight to the point..Have spent hundreds in last few wks,and cant seem to get the results I've been looking for..Wish I had seen the reviews on this prior to buying just matrix gear box and tb 6.03 and new motor.hope this will bring me back to the high competitive level at which Im used to playing.Thx for all the comments on this complete lower it has really helped me decide.