Standard BCL-12 clamp for supporting a 12-gauge MXT extension alongside the barrel, with accessory holes on both halves.

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Nordic Components Shotgun Barrel Clamp for 12ga Black Standard
Nordic Components Shotgun Barrel Clamp Designed For 12GA MXT Extensions, Compatible with Most 12GA Shotguns - BCL-12

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BCL-12 supports a standard 12-gauge MXT extension beside the barrel and provides one 10-32 accessory hole on each half. Nordic names BCL-12 in its M2 fit guide. In this guide it is bundled with the flush +3B tube and required NUT-BN-12-00 so the extension path is treated as one system. Nordic reserves the heavy-wall BCL-12-MB for different Nova and SuperNova geometry.
Add the Nordic Components Standard 12 Gauge Barrel Clamp to your build and see how it enhances your platform.