Issues after tight bore...
 

So I put a madbull 6.03 tightbore into my scar. I then loaded a mag with

bioval .20 to test the fps, and it seemed to be shooting fine at about 350-360.

But then when i loaded a mag with my madbull .28 and it started making a weird

pinging sound when firing, and the bbs are spinning right down no matter what I

adjust on the hop up. So i took the gun apart and started over and the same

thing, the .20 bioval seem to shoot ok but not the .28s?? Any ideas?

they're different sized BBs?
If anyone you play with has BB bastards, try those

Take your barrel out and from the hop end, drop a .28 through it to see how well it falls. If it is getting stuck, then either your barrel has some imperfections, your BBs are a shit batch for some reason, or, the final and most frustrating one, the gremlins have got you.

Turns out I didnt let the hop up off when I put the barrel in and jacked the nub

all out of place. I guess the .20s were not shooting right, because with

everything put back together properly its now shooting 375 fps with laser

accuracy. ;) I am learning..... Big thanks to everyone that posted to try and

help a newb.