This is KA Tech Airsoft’s Fully Built MP5K Polarstar Jack Features: -Polarstar Jack HPA engine with Safe, Semi, & Auto -Full Metal body -Polymer foldable stock (rock solid no wobble) -Custom Picatinny Mounts for Flashlight & Optic -m300u surefire flashlight with soft pressure pad -556 Eotech red/green holographic -Supressor Comes as shown with a fully tuned FCU wired to the grip 300fps at 110psi with a .25g bb and up to 50rps full auto