It's easy t tell new and old apart. The newer ones have a bolt release lever just behind the forearm. The old ones you had to either drop the mag or reach in with your finger and push down on the mag follower. Then there is the Longtrac and the Shortrac. These are the newest ones and use aluminum side plates. They are mucho lighter than the older BAR's. Still use the same mag as the newer Safari with the mag release. The older ones without the mag release used different mags.
