This is a Geissele super duty with the ultra duty lower kit everything was built from the ground up on this and has some parts on it that can't be found anywhere in the world anymore such as the 52 adjustment setting gas block that when I had bought there was only 3 left available that I could find online anywhere and Dillion stopped making them with that many settings, the brake on it was a $290 brake that can also be drilled out through the top and bottom to adjust where you want gas to go, the bolt has a friction coefficiency of 0.001 so it's very very slick, the trigger is a 3 lb pull, it comes with a Geissele full H3 buffer kit, the laser is a holosun laser that runs for $400 alone now the light is a surefire turbo with a 100,000 candela, has magpul iron sights, vortex 1-8 scope with a horse shoe style reticle that light up red and doesn't blow up when magnified, the stock is a magpul stock with waterproof storage and each side of it, b5 systems front grip, B5 systems pistol grip in the back with a way more vertical positioning, has a Geissele heavy duty barrel, you can text me for length and specs. The rifle doesn't move when shooting it like it's insanely tuned to where recoil was never a thing, the thing has only had 400 or so round shot through it as of today, I bought it and built it for hard use but life just came in and never really gave me time to do so sadly and I really hate to depart ways with it but I have to use the money towards some other stuff for now.