Product Description The Area 419 Plus 4 Magazine Extension (419-MAG-EXT-BLACK) is a precision-engineered solution for shooters looking to maximize magazine capacity without sacrificing reliable feeding. Where competing extensions are simply rectangular blocks, Area 419&';s engineers recognized that the bottom of the magazine is angled and cut the attachment rail at a matching angle. This thoughtful design ensures the column of rounds feeds straight down into the extension without any binding or feeding interference. The fluted exterior sides serve a dual purpose: they provide a firm gripping surface for fast magazine changes under pressure while also reducing overall weight. Initially designed for the American Rifle Company magazine platform, the extension has since been redesigned to fit a wide variety of AICS and Accurate Mag configurations. The matte black finish offers a clean, professional look compatible with most precision rifle builds. Note that these extensions are not compatible with AI AW magazines due to their fixed or welded floorplate. Product Highlights Precision-angled attachment rail mirrors the natural curve of the magazine, ensuring straight and reliable round feeding into the extension Adds up to 4 rounds of additional capacity to ARC, AICS, and Accurate Mag magazines for standard bolt-face calibers Fluted exterior sides provide a positive gripping surface for rapid magazine changes while helping reduce overall weight Versatile compatibility: fits ARC 10-round, AICS 5 or 10-round, and Accurate Mag standard bolt face and SAUM/WSM magazines Available in multiple finish options including black, blue, gunmetal gray, raw, and red Specs Brand: Area 419 Firearms Manufacturer Part Number (MPN): 419-MAG-EXT-BLACK UPC: 853675008273 Color: Matte Black Capacity Increase: +4 rounds Compatible Magazines: ARC 10-round, AICS 5 or 10-round, Accurate Mag standard bolt face and SAUM/WSM Incompatible With: AI AW magazines (fixed/welded floorplate) Item Height: 1.5 inches Item Length: 3.4 inches Item Width: 1.3 inches Weight: 0.22 lbs Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.