'Bingo Airsoft Designs' Tokyo Marui MP7 AEP top dead centre mod

thingiverse

The TM MP7 with a Bingo Airsoft Designs (BAD) kit installed runs circles around every other airsoft MP7 ever made. It's common knowledge that the standard hopup chamber wasn't designed to handle much more than a 0.25g BB at an original ~230fps. The problem is that the arm only gets pulled down by the adjuster on one side, which limits the hop power you can apply to the BB and causes it to hook slightly. In my case, I also found that it wouldn't hold the extreme hop setting well, backing off after a mag or so. This mod completely fixes that issue. You can set your hop and forget about it, as it'll easily hop a 0.3g BB to new heights with no trouble at all. The hop arm is pushed down in the middle, eliminating any hooking issues. To install this mod, you'll need: - An 8x8 M5 gutter bolt nut that slides into the groove - An M5 bolt for pushing (file the end flat). A mushroom head is ideal as they have the smallest OD and require the smallest allen key of the M5 bolt range - An optional spring to apply tension, so it never adjusts itself. You can use an M4 mag catch spring cut to an appropriate length I drilled a 5mm hole through the rail behind the faux screw for easier access with an allen key, but you could just set it and forget about it. The ring on the end slips over the front of the Jack unit in the BAD kit, ensuring perfect alignment every time. The pictured prototype doesn't have the retaining groove on the right-hand side as per the model. This keeps the parts fairly snugly together. I designed it to be a snug fit at the front with some super glue, but in practice, leaving it as is is fine, making this mod fully reversible. 2018/04/02 - Added 'no holes' version for user Rokinz