The Tippmann A5 HK 416 Barrel Kit features a quad rail shroud system that is made specifically to fit on the Tippmann A5. The 4 weaver style rails will accept all ‘weaver based’ accessories including RIS style grips, tactical flashlights, laser sights and scopes. The shroud and the rails are milled from aluminum and anodized black. The gun end of the shroud features two holes to attach it securely to the A5’s receiver.
The Real Action Paintball Tippmann A5 HK416 Barrel Kit is newer, so it should be commonly available, both new and used.