Here's an update on my DSG Tavor: Replaced the long barrel with a Dboys m4 carbine length. Trimmed off the hopup gearbox lip so it can be removed without opening up the gearbox. Chopped up the front end to fit a 7.4v 35c 2200mAH or 11.1v 25c 1600mAH inside the handguard. top is the OEM barrel and hopup modded Ares hopup (normal m4 one piece hopup can easily be modded but i didn't have a spare to test with). i filed down grooves to lock the barrel into place: (no need for screws or extra hardware). yeah, i screwed up a few times... LoL this idea is off the S&T Tavor..