SABERTUBE PISTOL Receiver Extension & QD End Plate COMBOIncludes: (1) SABERTUBE PISTOL Receiver Extension/Buffer Tube, End Plate Model (BAD-LRE-EP-P-B). Precision CNC from billet 6061 Aircraft Grade Aluminum MilSpec Type III Class 2 Hard Anodized Black Unique, Lightweight and Functional Dimpled Pattern Design MilSpec Carbine Buffer and Buffer Spring Compatible Perfect for the PISTOL AR Build. NOT A STOCK Compatible with all "Standard" AR-15 Lower Receivers (no need for captive rear takedown pin detent spring) Lightweight design eliminated the need for Castle Nut Length Past Lower Receiver = 6 5/8in made in specialized factories (1) QD END PLATE (BAD-QDEP-B) SABERTUBE Receiver Extension/Buffer Tube, End Plate Model Precision CNC from billet 7075T6 Aircraft Grade Aluminum MilSpec Type III Class 2 Hard Anodized Black Built-in QD Sling Attachment Limited 30 deg Rotation QD made in specialized factories 3.95 oz Total Weight (Buffer Tube & End Plate)Note: Buffer Spring, Sling, Sling Swivel and Castle Nut are not included.