MAGPUL Forward Sling Mount – Mossberg 590A1 HBI 1 cartridge spring

1 cartridge spring

meaning that the user manually operates the bolt to load and eject cartridges

That means every light in this series has an ultra-bright white LED

AGUILA AMMUNITION FOR WIN (WINCHESTER) INTERLOCK - DIFFERENT TYPES :

MAGPUL Forward Sling Mount – Mossberg 590A1 HBI 1 cartridge springDesigned for the A1's heavy walled barrels The Forward Sling Mount is a sling attachment point for the Mossberg 590A1 series of shotguns which clamps onto the barrel and magazine tube. Designed specifically for the A1's heavy walled barrels, it can be configured for use with either Push Button QD Sling Swivels or one point clip in style attachments such as the MS3 Paraclip, the HK hook, ITW MASH hook, and others. Made from precision cast steel that is