Up for grabs is a full metal A&K M4 receiver. Purchased from Andy’s Airsoft late last year for a friend’s gun, but it didn’t end up fitting a Matrix gearbox shell. I did a bit of dremeling on the inside to try and get the Matrix gearbox to fit, but it didn’t pan out. Quite minor though, will not negatively impact gearbox fitment. Will provide additional pictures upon inquiry. Includes selector switch, dust cover, forward assist, and functional charging handle (opens the dust cover). Willing to part with it for $10 plus shipping. Ships from Langley, BC.