Area 419 Magazine Extension Features The Area 419 Magazine Extension stands apart from typical extensions by cutting the attachment rail at an angle that matches the angled bottom of ARC and AICS style magazines rather than using a simple rectangular block. This design keeps the column of cartridges feeding straight down into the extension which the manufacturer notes is critical for reliability once an extension adds more than just a couple of rounds. The part is machined in a single operation on a 4th axis mill to achieve this angled fit precisely. Fluting around the sides of the extension provides a secure gripping point during magazine changes while also shaving some extra weight from the part. Originally developed from the American Rifle Company plus 4 mag extension the design was reworked to work equally well with AICS and Accurate magazines in both standard bolt face and SAUM and WSM configurations. Expected capacity increases vary by magazine and cartridge typically adding 2 to 5 rounds depending on the specific combination. The extension is not compatible with AI AW magazines which use a fixed welded floorplate nor with Magpul or other polymer AI magazines. Precision shooters running compatible ARC or AICS magazines will find this extension a well engineered way to add meaningful extra capacity without sacrificing reliable feeding. Area 419 Magazine Extension Specifications Manufacturer: Area 419 Model: Magazine Extension Compatible Hosts: ARC AICS Magazines Color: Black Material: Aluminum Finish: Anodized Capacity Increase: +4 Rounds Weight: 0.40 lbs Available At: GrabAGun