The Black River Tactical MarkBlue Gas Tube is a premium quality gas tube used to complete an AR with a Noveske Intermediate length gas system.

Note: Does NOT fit KAC Legacy MOD 0/1 or Wilson Combat 13.25"

The distinctive "MarkBlue" dot allows easy identification of a genuine BRT gas tube and guaranteed performance.

It is compatible with BRT MicroPin Gas Blocks, front site bases and low profile gas blocks.