The SLR Enhanced buffer tube assembly features a 6 position tube with precision polished inner diameter/finish for smooth, quiet operation. The Dimpled Castle nut allows secure retention without the need for staking; 2 set screws on end plate secure nut by lining up with dimples. This system allows for easy dissasembly and repeated use of nut and end plate. IncludesCarbine buffer tubeCastle nutReceiver end plateHardware FeaturesSLR 7075 Enhanced buffer tube with Black harcoat anodize.SLR 4140 Receiver end plate with Limited rotation QD with Melonite finishSLR 4140 Castle nut with Melonite finish