The Ruger 90640 is a genuine factory magazine adapter that lets you run a 10-round .45 ACP magazine from the full-size Ruger American Pistol in the compact American Pistol Compact.

Key Specifications

• Converts 10-round .45 Auto magazines from the full-size Ruger American Pistol (90512) for use in the American Pistol Compact.
• Chambered for .45 ACP.
• Molded from black polymer.
• Classified by Ruger as a Magazine Adapter.
• Genuine Ruger factory accessory.
• Sold individually, one adapter per package.
• Ships at a shipping weight of about 0.07 lb.
• By itself the adapter holds no rounds — it fits an existing full-size magazine to the compact frame.
• Installs without any permanent modification to your pistol or magazine.

Frequently Asked Questions

Does this adapter come with a magazine? No — it’s the adapter only. It lets you use your existing full-size American Pistol .45 ACP magazine in the compact model.

Is this a genuine Ruger part? Yes — it’s a genuine Ruger factory accessory, not an aftermarket copy.

Buy the Ruger American Pistol Compact Magazine Adapter

Ships fast from a Lubbock, TX gun shop on the Ruger American Pistol Compact Magazine Adapter from Ruger, part of our Rifle Magazines selection. Pick one up to run full-size magazines in your American Pistol Compact.