It's more likely the weight/mass of the 0.25g BBs preventing the magazine spring from working properly.

My Thompson seems to prefer .20s too. One thing I will recommend: Don't overfill the mags - they'll jam. I use KA mids and fill a "pistol mag&q...

Take both, and see which works better for you.

Don't forget to add a muzzle nut retainer spring. Details here: viewtopic.php?f=13&t=12807

Threads? Funnily enough, when I looked last night I realised I had fitted the screw, but I'd forgotten, and haven't tested/adjusted it yet. Maybe th...

Interesting. Where did you get yours? I got mine from UN Company, shortly after they first came out. Mine has the thread.

I only have M3 x 5mm, so I'll see how that goes...

Could it really be that simple? Yes. The screw is even shown on the exploded drawing. Ps. It has just dawned on me though that if the grub screw push...

They were in the spam box. Why they suddenly started going in there, I have no idea.

Nice.

and what are the other five words? Smart arse time metal–oxide–semiconductor field-effect transistor Give that man some lead-free solder.

IIRC, no BAR had semi, just 2 different rate autos.

6 words: MOSFET

if you want any measurements or want to copy idears feel free to ask,what mags are you useing? Cheers, thanks! I'm going with MP5 mags, though i migh...

That'll probably be the "budget" version with plastic gears/gearbox.

I don't own one, so I can't say if it'd work, but what about fitting a magazine to hold the hop in place?