Dead Foot Arms Modified Cycle System Rifle Caliber AR-Pistol Kit 2.5in Black. It includes: Buffer Tube and End Cap Assembly MCS M-16 Bolt Carrier Group finished in Black Nitride end plate with QD port plunger and recoil and buffer spring. Specifications for Dead Foot Arms Modified Cycle System Rifle Caliber 2.5in AR-Pistol Kit: Manufacturer: Dead Foot Arms Color: Black Anodized Finish: DLC Fabric/Material: Steel Gun Make: AR Platform Gun Model: AR-15 Length: 5 in Weight: 1.5 lb Caliber: 5.56x45mm NATO .300 AAC Blackout .223 Remington Country of Origin: USA Features of Dead Foot Arms Modified Cycle System Rifle Caliber 2.5in AR-Pistol Kit 2.5in Buffer tube Rifle Caliber BCG Package Contents: Dead Foot Arms Modified Cycle System Rifle Caliber 2.5in AR-Pistol Kit What firearm models does the manufacturer say Dead Foot Arms Modified Cycle System Rifle Caliber 2.5in AR-Pistol Kit is compatible with? The manufacturer says that Dead Foot Arms Modified Cycle System Rifle Caliber 2.5in AR-Pistol Kit is compatible with AR-15Dead Foot Arms 78720: Modified Cycle System Rifle Caliber AR-Pistol Kit Black