Problem with a couple of my GBB's
 

For a while my KJW M9 has had this problem, and now my TM Desert Eagle has started doing the same thing.

When firing, the bb does not get shot out the barrel, instead it only rolls out of the front end. I tried looking around, for similar issues but I was unable to do so.

Has anyone here had this problem before, and if so, did ya fix it?

Any and all help is appreciated.

tried turning up the hop up?

Tried that already. It worked at first, but it went right back to being a bastard.

On the TM DE, you really need to crank the hop up all the way. It's a modified TM G36C style hop up, but unfortunately it doesn't stay in place. If you crank it to the max, the passage of the BB will shift it down to where it needs to sit. From there you shouldn't have any roll out issues.

It seems trivial, but your propane tank may be almost empty, so it doesn't have enough gas pressure to fill the whole mag.
I've had the same "bb rolling out of the barrel" issue with my TM hi-capa, and the problem was my almost empty propane tank. So just get a new propane tank and give it a try.

Also make sure your floating valve is unobstructed. If it isn't opening all the way, the gun will still cycle but BBs will not be shot out fully.

Deagle problems
 

if you installed the 170 recoil springs it will push the bbs right out the end youll need a metal slide to use the 170 springs,

if you didnt install them i have no clue, it didnt do that for me

Cracked/broken loading nozzle ?
Piston head/o-ring ?

i had a similiar problem on my kjw p-14/15 para-ord. Turned out to be broken hammer spring,,,maybe thats your problem.

If the slide blows back like normal and you can tell there is normal gas pressure when you fire your gun, its either a matter of the BB is not being held by the hop up propperly and is just sitting on it allowing gas to escape around it or there may be an obstruction in the area of the feed position. If iregular gas pressure (too little or too much) first check where most of the excess gas escapes at it may be a bent or obstructed nozzle causing the gas to shoot for example up into the slide rather than into the barrel. Most likely not it but check the the slide is all the way forward, if its not see what is causing it as the gap is allowing gas to escape.