Conversation so far:
when was the 30 round m16 magazine introduced
Production of the 30 round magazine for the M16 started late 1967 but did not fully replace the 20 round magazine until the mid 1970s.
how much do standard usgi aluminum 30 round m16 magazines weigh
Standard USGI aluminum 30 round M16 magazines weigh 0.24 lb empty
how long are the 30 round m16 magazines
Standard USGI aluminum 30 round M16 magazines are 7.1 inches long
are the newer 30 round m16 magazines longer
The newer plastic 30 round M16 magazines are about a half inch longer. The newer steel magazines are about 0.5 inch longer and four ounces heavier

Question: are the newer magazines heavier
Self-contained rewrite: are the newer 30 round m16 magazines heavier