Boneyard MP5

Brought it off a person said it fully worked went to a game it worked fine for about a couple of hours then all of a sudden FPS was dropping BBs weren’t going far took it back originally it was doing 280 FPS on 0.28 Been all of a sudden dropped to 80 to 100 FPS I paid 200 for the Gun looking to get just 100 back if interested contact me Collection only I do not post also comes with five mags for a quicker response contact me on WhatsApp at 07444165051