H&K HK MR556/416 Mil-Spec Enhanced Buffer Tube

HK 416 & MR556 OTB (over the beach) Buffer Tube/Receiver Extension

Each mil-spec buffer tube has built-in drainage holes in the rear of the tube and also on the bottom to maximize efficiency. Each buffer tube has ball-bearing rollers to tighten the stock when locked in position. This helps smooth the sliding action when changing between the six positions, which eliminates any back-and-forth sway from the stock. 

Compatible With:

• All HK 416/MR556 E1 or E2 Stocks
• Any Mil-Spec AR-15, M16 Stock

Technical Note: The OD of this tube is 29.20mm or 1.150"