Mean Arms AR-15 Loader .223 Caliber/5.56mm 10 Round Black. 56x45 that will allow you to safely and efficiently reload your fixed magazine without the need to break down the firearm. Simply place the MA-Loader into your AR-15's ejector port and press the thumb-ring slider to quickly load or reload. Specifications for Mean Arms AR-15 Loader: Manufacturer: Mean Arms Color: Black Finish: Black Caliber: 5.56x45mm NATO .223 Remington Gun Model: AR-15 Number of Rounds: 10 Additional Features: California Compliant Features of Mean Arms California Compliant AR-15 Fixed Magazine Loader Fits: MIL-SPEC Receivers Package Contents: Mean Arms California Compliant AR-15 Fixed Magazine Loader Mean Arms 2100169: AR-15 Loader .223 Caliber/5.56mm 10 Round Black