EDIT: This thread is dedicated to my very old, abused, probably 4th hand TM MP7 GBBR. You’ll find some good sources of fixes below.
A month or so ago I bought a slightly used, and abused second hand TM MP7 GBB with 5 mags for a decent price. Came with a few extra's. Which is great!
Needless to say this gun has been a labour of love to get working right. Leaking mags, broken parts of the chassis. Much swearing and threatening to throw it off a cliff. But I kept at it.
So, After every thing is finalised. It has a Mod Tan bucking, and the Nineball gas routes fitted. It also came with a Guns Modify nozzle. Fill a mag with green gas (Nuprol 2.0) and im getting 360FPS. Pop a stock gas route back in and it starts creeping to 370. I had the thing firing at 380FPS at one point!
So I buy some Nuprol 1.0, and it fires bang on 350. Only downside is I had to trim a coil off the buffer spring (The spring on the stock plate) for the bolt to travel back far enough to engage bolt lock reliably.
So if I find and fit a stock nozzle, and return it back to stock it might fire 350 on Nuprol 2. What FPS readings are you getting?
It be nice to run the gun safely on Nuprol 2 for the crisper function. But I have no idea if the FG discs will fit, and no known NPAS's are available. (That I can find). I have no clue why this thing fires so hot! (For a TM any way)
I will mention, I did use it on a warm afternoon, on Nuprol 1, with the little tweaks, and it worked well! But god the recoil spring is sill weak to reset the auto sear. Hate having dead trigger after bolt release!