this may sound stupid....

[zone 69]

Originally Posted by mr_nuts31

TBH I didn't do anything to it, hell the guide rail popped off when I opened which by the looks of it, was already broken before I checked

Oh and on a side note, please ignore the angry lesbian back there

Well i would say you have a lemon M-box most likely from factory unlucky bad molding and cracked/fractured apart over time.

Replace ASAP to avoid further damage.

Edit:

[HKGhost]

Originally Posted by zone 69

Well i would say you have a lemon M-box most likely from factory unlucky bad molding.

Replace ASAP to avoid further damage.

I highly doubt it came from the factory like that. Most of these shells are cast and that looks like a perfect line across so I'm sure it was cut. The factory will surely catch something that big missing even if they have poor QC.

[Azathoth]

That looks like a dboys m-box. Someone cut that for some purpose and if it just fell out as you took the gun apart then it was intentional. Go bitch to the seller.