This is a Nordic Components Shotgun Magazine Tube Components chambered in 12 Gauge, model BCL-12.
The Nordic Components standard shotgun barrel clamp provides extra rigidity for your magazine extension. Each clamp half has a centrally-located 10-32 threaded hole to accept accessories" such as a sling stud" barrel clamp tac rail or QD sling mount. Designed for Nordic extension tubes (1.060" diameter).
Features:
Threaded Hole to Accept Accessories
Provides Extra Rigidity
Designed for Nordic Extension Tubes (1.060″ Diameter)
