BB s roll out of barrel

[russianweeb1099]

I recently picked up a used PTS Mega Arms MML Maten as a project.Its essentially a KWA M4 inside. The owner said something was wrong with the hop up. It'll chamber a round and fire no problem, but it has no power behind it. Most of the time the BBs just fall out of the barrel. Any ideas on what I should do?

 

[Prisce]

Check the nozzle. 

Check the condition of the hop rubber and nub.

 

[Shizbazki]

Hop rubber, the nub in the rubber is often what applies a litte pressure on the BB to hold it in the barrel.

 

[Samurai]

In an AEG the hopup rubber's mouth is keeping the second BB to enter the barrel. If it's worn or just too big, it will feed 2 BBs. Change the hopup rubber.

You can test it: make sure the nozzle is retracted, drop a bb into the hopup - gun is upside down - and if it goes into the barrel only with gravity or a very gentle touch with something that fits there, then it's bad. It should need a small but noticeable force.