sorry for high jacking this older thread, but i own a HK416 .22 too.
is it for sure that you don't have to loosen the flashhider for disassembly?
i couldn't find anything in the manual and on youtube/umarex channel, they disassemble the HK 416 without loosening the FH.
so is it true that you only have to loosen the FH on the walther/umarex M4 models, but not aon the walther/umarex HK 416 models, right?
a little bit earlier int his thread you talk about standard and high velocity .22 l.r. ammo.
for the use of standard velocity or high velocity rounds, you can adjust the recoil spring pressure with a hex screw for each variant of ammo after flipping open the upper.