I have a CZ 527 in 223 and got a couple of 527 mags in 204 rem. They look the same and fit the gun with ammo in them. Anyone know whats different on them? mag follower is marked 204.

Spacer for internal length. If anything, the .204 has a longer intenal length.

Lips might be a bit tight, but nothing a fine file or stone couldn't fix.

thanks!!