Hi guys, the GHK AKM is definitely the most confusing thing I have ever encountered.
 
	Now, here is the issue: after hundreds of shots, my new ghk akm's original hop-up unit malfunctioned and damaged my new maple leaf nub. 
 
	 
 
	I got a new maple unit for it, but it seems like it can't fit the base ?! (already change to a GBB barreal)
 
	Does anyone have any ideas? Thanks.