The Valken Tactical Battle Machine 2.0 - Introducing an SD line of AEG's that come standard with an Aluminum Mock Suppressor and an inner barrel that stops at the beginning of the extension, gives players the option to upgrade to a longer inner barrel. The SD has been built for close quarters indoor velocities of 330-340 Feet Per Second with 0.20 gram precision BB's. The MOD-SD is a great option for anyone looking for that suppressed look. With a wobble free HDP RIS that is low profile and comes with our new Dual Profile Hi-Viz Flip Up Sights. All Battle Machines come with a retractable 6-Postion Crane stock that accommodates a range of NiMh 8.4-9.6v and LiPo battery configurations, with plenty of room and an easy to remove butt plate without the need for tools.