BMR Magazine Block Limiter for the Magpul PMAG GEN M3 AR15 - Compatible with 10, 20 and 30 round variants as well as the Standard and Windowed version.Buy one for EVERY magazine!Badger Mountain Research provides a full-block magazine limiter, to temporarily or permanently reduce magazine capacity for the wide ranging reasons one might expect. If you have existing magazine rebuild-kits, this is a great option to have on-hand in the event you need to demonstrate the reduced capacity of your rebuild-kits in either temporary or permanent form. We HIGHLY recommend every Magpul PMAG owner have one for each and every magazine, especially for those in restricted jurisdictions.The BMR Magazine Block Limiter reduces the over capacity of a magazine by physically preventing the body of the magazine from accepting more ammunition than intended. We've made them available in a wide range of bright and bold color options for quick magazine identification or to simply add a little aesthetic to a plain magazine.Installation is quick, the Magazine Block Limiter installs by simply removing the magazine floor plate, removing the lower spring attachment insert, snapping the Magazine Block Limiter onto the existing spring, sliding everything back inside the magazine body, then replacing the original floor plate. Done!The Minus 15 Block Limiter, reduces capacity by 15 rounds, while our Minus 20, reduces ammunition capacity by 20 rounds and of course, you can guess what the Minus 10 does.Features:- Installs in seconds- No tools necessary- No modification needed, magazine remains in-tact- Available in a wide range of colors for identification- Made in the USA- Material compatible with common super-glue for permanent modificationNeither Badger Mountain Research or Badger Mountain Supply makes any legality claims concerning any of our products. We recommend all customers seek professional legal counsel when faced with questions or concerns over firearm and firearm accessory related matters.