The SOLGW Intermediate Buffer Kit include everything you need to upgrade your lower receiver to use the excellent A5 buffer system, something that SOLGW supplies as standard on the majority of their rifles. Includes: 7076-T6 Aluminum, 9 Position A5 Tube with rolled threads, Tyle 3 Class 2 hard anodized, dry film lubed, mil spec diameter. Sprinco rifle length Green Spring SOLGW/BCM T2 Buffer FCD CN5F Castle Nut & B5 QD End Plate Mfg: Sons Of Liberty Gun Works