WE M4 firing issues
 

Hi everyone. I'm having an issues with my WE M4 GBBR not firing. The gun cycles correctly bolt goes all the way back, hammer cocks, BB is inserted into the chamber but no BBs come out the barrel. they just seem to stack inside the chamber. I've tried adjusting the hop up with no effect. I have 2 mags and there is no difference with either of them. The gun does fire however if I insert a mag with no BBs just gas. Any help on this will be much appreciated.

Your hop up assembly is probably out of whack. If you are able you should disassemble the hop up completely and reassemble it. Search Wetti and you will get a 300 page thread about WE problems, this one is in there.

Have you tried running a cleaning rod through the barrel? If there's one BB stacked, followers won't get through and stack over and over.

by chance do you have a ratech npas and ratech tightbore?

had the same problem with my 416 last week. mine was it will fire but no bb's will exit. then when i tip the barrel down all of it will fall off. someone told me my hop up was gone! i dissambled it , cleaned every inch of it specially the barrel and the hop up. then lube. now its back firing again.. i lube the npas o -rings and adjust the hop up to loosen it a bit. and viola!

if your setups include ratech tightbores and npas the following applies, they are unfortunately not designed for each other. you must either sand down your npas or change back to your original nozzle. it is however possible to change the internals between the two nozzles and avoid sanding.

I solved the issues. I disassembled the inner barrel assembly and made sure it was lined up like Eeyor sugested. When I put it back together I forgot to put part 117 back in, well my M4 fired with no problems other than low fps. So I sanded the inside of part 117 until now it shoots flawlessly. Thank you all for your help.