Chiappa Firearms M4-22 Pro Upper .22 LR 16 28 Rounds 11E36C0F CH. 22LR rifle perfect for plinking of training. The forend is a 11.8in long Quad Picatinny with a 16in steel barrel. Specifications for Chiappa Firearms M4-22 Gen II Pro .22 Long Rifle 16in Picatinny Upper Receiver: Manufacturer: Chiappa Firearms Caliber: .22 Long Rifle Barrel Length: 16 in Barrel Profile: Heavy Contour Barrel Twist Rate: 1-16 Firearms Threads Per Inch: 1/2x28 Finish: Matte Color: Black Fabric/Material: Polymer Handguard Length: 11.8 in Gun Rail: Quad Picatinny Gun Type: Rifle Gun Make: Colt Gun Model: M4 Weight: 6 lb Magazine Included: Yes Features of Chiappa Firearms M4-22 Pro Upper .22 LR 16 28 Rounds: Evolution M4 model 11.8" free float aluminium forend 8 position Picatinny rail 18.5" heavy match parkerized barrel Mil-Spec components Package Contents: Chiappa Firearms M4-22 Gen II Pro .22 Long Rifle 16in Picatinny Upper Receiver What firearm models does the manufacturer say Chiappa Firearms M4-22 Gen II Pro .22 Long Rifle 16in Picatinny Upper Receiver is compatible with? The manufacturer suggests that Chiappa Firearms M4-22 Gen II Pro .22 Long Rifle 16in Picatinny Upper Receiver is compatible with M4The Gen-II Pro Series Rifle upper is an evolution of the M4 model adding an 11.8" free float aluminium forend with 8 position Picatinny rail. All other characteristics remain unvaried: 18.5" heavy match parkerized barrel steel bolt Mil-Spec components. Fully functional with select fire lowers CH500095