Black River Tactical MarkBlue Stainless Steel Gas Tubes

The Black River Tactical MarkBlue Gas Tubes are a premium quality gas tube that offer guaranteed performance.  

Each gas tube ships with (1) Stainless steel spiral coil spring pin.

MarkBlue Tubes are available in the following lengths:

• Pistol Length
• PDW Length
• Carbine Length
• EXC Length
• Mid Length
• EXT Length
• Intermediate Length
• Rifle Length