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Description
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