AR-15 Carbine Buffer Tube Assembly Mil Spec Diameter - 6 Position Buffer Tube, End Plate, Castle Nut, 3 oz Buffer, & Spring
XLR Standard Buffer Tube - XLR Industries
Amazon.com: Spacer for Using Puffer - Adaptive Aid for Better and Deeper Puff Delivery Into Lungs - Coordinates Puff Inhalation with Natural Breath : Health & Household