GHK AKM jam

[Koooo]

Hi guys, new to GHK, but that my new AKM really disappoints me, don't know why the bolt action frequently jamed (either semi or auto). Anyone meets the same problem ?

View attachment 101763

View attachment 101765

 

[Enid_Puceflange]

Hi

Anything stuck near the hop , like a trapped bb that could be stopping the bcg going all the way forward?

 

[Koooo]

Thanks guys, I found the problem. GHK's orginial hop bucking is borken, which causes the misfView attachment 101786eed。。。。