The TAM-4 Tube Assembly is a machined MIL-SPEC Aluminum receiver extension tube kit that accepts all M4-style MIL-SPEC adjustable carbine buttstocks and most commercials. 

The set includes:

• Buffer tube
• Carbine counterweight buffer
• Carbine recoil spring
• Locking  ring
• TSA receiver plate (sling adapter)
• GLR16 Butt Stock

Advantages: 

• Six precision-machined notches on the underside provide plenty of options for setting length-of-pull.
• Perfect for a custom build, installing a MIL-SPEC or commercial stock on a civilian carbine, or updating a fixed-stock rifle with an adjustable M4 stock.
• Machined from a lightweight Aluminum extrusion, then hard coat anodized, and dry film lube-coated inside for smooth movement of the buffer and buffer spring.
• Provided carbine recoil spring and buffer tube, carbine counterweight buffer, locking ring, and the TSA receiver plate (sling adapter)

Suitable for:

AR15 / M16 / M4

Specifications:

• Material: Machined from a lightweight Aluminum extrusion, then hard coat anodized, and dry film lube-coated inside
• Weight: 274 g
• Hight: 37 mm
• Length: 182 mm
• Diameter: 29 mm