I do like the plastic mag. The metal works ok but the carts seem to slide easier from the plastic. After a few adjustments, the old 64s work great. Kept clean and oiled, they function as well as the new guns. For a 40 - 50 year old gun...who could ask more.
A person can order the metal mags from SIR ( Cabelas) for the $20 mark. Why pay more? Show prices are high for all sort of gun paraphernalia.