All our uppers are carefully assembled and tested and ready to go out of the box. Every component is chosen to ensure a high quality upper is produced. Every upper is custom built to order and we go the extra mile to ensure the finished product is to your specifications. This 223 Wylde upper kit starts with a Gibbz Arms LEFT HANDED G4 Non Reciprocating Side Charging Billet Aluminum receiver, mated to a Tactical Kinetics 22 inch 223 Wylde, Rifle Length Gas System, 1:7 Twist, Medium Profile, 416R Stainless Steel, Bead Blasted Finish, Premium barrel. The Gibbz Arms receiver is a proprietary patented receiver that has a non reciprocating side charging handle - handle stays forward during cycling. Side handle is on the opposite side of ejection port allowing the shooter to quickly charge or recharge the weapon without taking finger off the trigger and eye off the scope. Tactical Kinetics is one of our major partners and they produce high quality, accurate barrels. This barrel is from our premium line which features a high quality stainless steel bead blasted to a Satin Like Finish. The 223 Wylde Caliber is compatible with 223 REM and 5.56 NATO ammunition. The Ghost Rail is a free floated system, M-LOK slots on all three sides, full length picatinny rail at the top, lightweight handguard. Barrel Nut is made out of solid steel to ensure a solid mounting system. Comes with the P2A LEFT HAND Bolt Carrier Group. Also included is a lower parts kit and M4 Milspec Stock Kit to turn your stripped lower receiver into a full pistol or rifle SOPMOD stock by JE Machine Tech is OPTIONAL. Features a wide cheek weld, rubber non slip butt pad, two water tight storage compartments and stainless steel QD swivel mount. Made in the US. We also offer a CHOICE of Muzzle Devices - upgrade the flash hider to a Black or Stainless Competition Muzzle Brake. This is an enhanced version of the popular style muzzle brakes. The baffles and ports are milled larger to drive pressure up and to keep the muzzle down more effectively. We can also UPGRADE the GAS BLOCK to an Adjustable Gas Block. Great option if you are using a suppressor or just want to fine tune your system. We can also UPGRADE the TRIGGER to a Rise Armament RAVE 140 or a Timney Impact Trigger. Great option if you are looking for a lighter and more crisp trigger pull. We also offer an OPTION to add a 80% 7075 T6 Aluminum Milspec Lower Receiver (Raw or Anodized) to your kit. SPECIFICATIONS UPPER RECEIVER: Gibbz Arms LEFT HANDED G4 Non Reciprocating Side Charging Billet Aluminum Receiver with Gen 2 Handle, M4 Feed Ramps, Type III Hardcoat Anodized Black (Gibbz Cam Pin Included) BARREL: 22 inch, 223 Wylde Caliber (shoots 223/5.56), 416R Stainless Steel, 1:7 Twist, Medium Profile, Bead Blasted, Premium Barrel - made by Tactical Kinetics HANDGUARD: 15 inch M-LOK Free Floated, Machined out of 6061 T6 Aluminum - made by Bowden Tactical GAS SYSTEM: Rifle Length, Direct Impingement, Stainless Steel Tube GAS BLOCK: Low Profile Gas Block, Machined out of 4140 Steel MUZZLE DEVICE: Standard A2 Flash Hider with Crush Washer BOLT CARRIER GROUP: LEFT HAND, 223/5.56 Caliber, M16 Profile, Mil-Spec, MP Tested, Nitride Treated, Properly Staked Gas Key, 8620 Steel Carrier, 9310 Steel Bolt LOWER PARTS: UNBRANDED AR ELG Lower Parts Kit STOCK: M4 Milspec Stock Kit - includes standard buffer spring, 3oz buffer, castle nut, latch plate and 6 position Milspec buffer tube 100% MADE IN THE USA OPTIONAL: UPGRADE TRIGGER to a Rise Armament RAVE 140 or a Timney Impact Trigger OPTIONAL: ADD a 80% Milspec Aluminum Lower Receiver (Raw or Anodized) OPTIONAL: UPGRADE Muzzle Device to a Black or Stainless Competition Muzzle Brake OPTIONAL: UPGRADE STOCK to a JE Machine Tech SOPMOD Stock OPTIONAL: UPGRADE GAS BLOCK to an Adjustable Gas Block