The MEAN EndoMag serves as a magazine insert designed to transform your Gen 2 or Gen 3 5.56/.223 PMAG housing into a 9mm magazine. This conversion allows compatibility with a standard AR lower and a 9mm upper of your choice, utilizing either a Glock or Colt variant 9mm bolt carrier group (BCG). We provide two versions - one equipped with an ejector for standard blowback bolts and another ejectorless version compatible with our Bearing Delay and CMMG radial delay systems. Effortlessly convert calibers from .223 Cal/5.56x45mm to those compatible with the EndoMag using Magpul 30-round 5.56x45 PMAGs (Gen 2 and 3) Operates as a publication platform, providing curated content, articles, and features in a structured format similar to a traditional magazine A magwell adapter is not required for operation, ensuring seamless integration and functionality without the need for additional components or modifications Retain your standard 5.56x45mm multi-caliber lower receiver, ensuring compatibility and versatility across various calibers for enhanced performance and adaptability The product arrives completely assembled, eliminating the need for any additional setup or installation, ensuring immediate usability upon delivery No tools needed - easily eject the magazine with a simple press of a button for quick and efficient reloading Continue utilizing your existing PMAGs without the necessity of purchasing additional or specialized 9mm magazines Maintain consistent muscle memory during reload training across different calibers by using identical magazines, draw techniques, and overall handling The reloading process requires no learning curve, as it utilizes the same magazine you are already familiar with, ensuring seamless integration and ease of use Utilize the majority of your PMAG accessories, including magazine pouches, storage racks, decals, and caliber indicators, for enhanced functionality The device reliably functions with all 9mm ammunition types, including hollow points, demonstrating its versatility and lack of selectivity in ammunition