BB2K Airsoft does an unboxing of the latest version fo the APS CAM870 CO2 Airsoft Shotgun, the APS CAM870 SAI MK2... "Today I'm packing a real treat for you. The APS CAM M870 is an airsoft pump action rifle that is next to the real model. No inner barrel, up to 12 BBs per shot and all with Shelleject. The MK2 has, in contrast to the MK1, the CO2 in the closure instead of in the sleeve. This again increases the proximity to the Real Steel but also has a few advantages.