Two-stage trigger when in full-auto mode; pulling the trigger back half way fires a shot in semi-auto, a full trigger pull fires gun in full-auto Enlarged hop-up door can be accessed by pulling the charging handle to the rear, revealing a rotary hop-up 200rd to 50rd convertible magazine with last-round BB follower, Magazine cut-off makes gun cease firing when magazine is emptied Redesigned Krytac P90 gearbox that utilizes Japanese caged 8mm bearings, easily accessible quick change spring mechanism, in-line MOSFET, and automotive fuse Externally accessible length of trigger pull adjustment All for 150 off MSRP. Asking 300 shipped through p@y pal, 320 shipped through hopup.