G&P Advanced Type Aircraft Aluminum Metal Receiver for M4 M16 Series Airsoft AEG Rifles - Black (Blank)

"gearbox fitment is really tight but with some filing you are going to be okay. Fitment in general is EXTREMELY TIGHT, my G&P charging handle is a tight fit, as well as its own mock bolt and dust cover. The dust cover does not close because of its shape. Once it is all fitted it is SEXY.

Heres what it comes with:
Receiver, upper and lower
Dummy fail button
Mock bolt and Dust cover
G&P hop-up unit
Takedown Pins

WHAT YOU WILL NEED (what I used)
Fire selector (SHS fire selector)
charging handle (G&P Jungle style)
mock bolt release (King arms mock bolt catch)
magazine button (Krytac mag button)
Trigger guard (PTS trigger guard)

P.S.
Do not buy this unless you are EXTREMELY familiar with airsoft m4 externals and you know what you are doing.

"This receiver is a beauty, no wobble and no gaps at all. The finish on this receiver is nice to the touch (satin) and reasonably scratch resistant. Feels solid like the real thing.

The black color is really black, good match for the rest of the furniture I already have. Read some reviews saying that G&P black color is a bit light, this one is not. The outer barrel hole is reagular size (not tappered).

Arrived with a complete hop up metal chamber and bucking, body pins (front, rear and middle), assist knob (with spring and locking pin), charging handle spring (no charging handle), metal dust cover port, metal cover for the hop up, dust cover release lever and fittings for it.

It's not getting a full 5 starts because the dust cover port won't close, the latch is big and makes contact with the gearbox before closing.
The selector switch holes aren't placed correctly (or G&P has another standard), had to drill holes just outside the original holes.
I'm using a Hop Up chamber with Shock Transfer System by SHS and had to remove the metal hop up cover, it won't slide.

Had it laser engraved since it doesn't come with any markings (not even SAFE - SEMI - AUTO).

Pros:
Really nice built and finished
Comes with some extras (good price for upper+lower receiver and small parts)
No markings, nice if you're custom engraving it
Toolless front and rear pins, easy to tear it apart
Magwell fits great (at least with the G&P and CYMA mags I got)

Cons:
Could come with more extras (like a selector switch)
Dust cover port only closes without a gearbox...
Could have selector switch holes drilled for both G&P and other brands of selector switches
No markings on the receiver (if you're not willing to engrave it)

"aweful. Does not work with all v2 gear boxes holes did not line up. Don't buy unless you are sure that your gear box will fit properly.