...DPMS created when they dropped the AR-15 VLD magazine (in all fairness i think the guy that was making them for DPMS died, as far as i know). Here's a couple pics on how it functioned--
That's the 75 A-Max loaded to VLD magazine length. This system helped tremendously with long-range varminting.


That's the 75 A-Max loaded to VLD magazine length. This system helped tremendously with long-range varminting.