Includes: Pistol Buffer Tube Buffer Tube Foam Pad Buffer Buffer Spring Steel End Plate Steel Castle Nut Detail: CNC machined aluminum buffer tube to fit carbine buffer and spring. Hard anodized type III black finish. Machined lower slot to accept all end plates and sling mounting accessories. Superior Quality Carbine Buffer Spring Standard 3 oz buffer Quality Polyurethane Bumper for longer life Steel Ambidextrous End plate and Castle nut. Buffer tubes measure 7-5/16" Buffer Tube Foam Pad is made from NPVC also known as NBR or Nitrile.