Area 419 Magazine Extension Features The Area 419 Magazine Extension solves a problem most aftermarket magazine extensions ignore. Simple rectangular block extensions do not account for the angled bottom found on ARC and AICS magazines limiting how reliably they feed once more than a couple of rounds are added. Area 419 addressed this by cutting the extension s attachment rail at an angle that matches the magazine body so the column of rounds travels straight down into the extension rather than fighting a misaligned interface. The extension is machined in a single operation on a four-axis mill an extra step that delivers a noticeably more reliable feed path than typical extensions. Fluting around the sides of the extension gives the shooter a confident gripping point for magazine changes while trimming unnecessary weight. This universal extension is designed to work across a range of magazines including the ARC 10-round magazine as well as AICS and Accurate Mag magazines in 5 or 10-round configurations and standard or SAUM/WSM bolt face patterns. Depending on the magazine and cartridge it adds roughly three to five additional rounds of capacity. It is not compatible with AI AW magazines due to their fixed welded floorplate nor with Magpul or other polymer AI-pattern magazines and it is anodized in blue and machined from aluminum for the fit and performance Area 419 is known for in its precision rifle accessories. Area 419 Magazine Extension Specifications Manufacturer: Area 419 Model: Magazine Extension Compatible Hosts: ARC / AICS Mags Color: Blue Material: Aluminum Finish: Anodized Capacity Increase: +4 Rounds Weight: 0.40 lbs Available At: GrabAGun