The only problem i might have if i bought the 30th and tried to change the RIS is the fact that the new one has a silencer instegrated in there and it looks like it might be some work to get that all changed out
Ehhhhhh ???? silencer ????, has a flash hider, removable top front sight and the top railed handguard is sturdy enough to mount a grip underneath using the 3 mini rails supplied.
So there's a good bit of railed area for most peeps and clean top rails if remove front sight - but can't see silencer just normal M4 flash hider
if and I say if owner wants to change it around later then money saved £270 metal FFR12 it seems vs £150 GC 30th, that is £120 to tweak around with. Seems same CM box & motor to me - not a Top Tech G&G just an intermediate G&G. TBH I doubt if I would really buy an expensive G&G as base models are good and very tweakable as they are but that is my take on it