They're good.. Look for one with the origional finish (greyish green), and get all the accessories..The magazines DO wear out, if you shoot a lot of hot loads.. (The cartridges move back and forth in the mag body under recoil, and work harden the body til it cracks at the top..) But they're cheap, get a bunch..
I hve only played a little with the 9mm conversions, preferring the 7.62X25 in that handgun..They worked, but were'nt as impressive..
Meplat-