Description
This is a genuine Colt factory magazine designed for the Government and Commander pattern 1911 pistols in .45 ACP. Built from durable stainless steel with a natural finish, it holds eight rounds and comes equipped with a protective polymer bumper pad on the baseplate. The bumper helps absorb impact during tactical reloads and drops while keeping the magazine looking sharp.
The magazine features a steel spring and flat follower that work together to deliver smooth, reliable feeding. You get witness holes on both sides of the body so you can quickly count your rounds without removing the magazine from the pistol. The baseplate comes off easily for cleaning and maintenance, and the whole design keeps things straightforward and dependable.
What makes this magazine stand out is that it's built to Colt specifications right from the factory. The Government and Commander models share the same grip frame and magazine well, so this eight-round magazine works with both platforms. It's the kind of magazine that just works when you need it to, without surprises.
Key Specifications
- Manufacturer: Colt Manufacturing
- Model Part Number: SP300555-RP
- UPC: 098289900548
- Caliber: .45 ACP
- Capacity: 8 rounds
- Construction: Stainless steel
- Finish: Stainless
- Baseplate: Polymer bumper pad
- Compatibility: Colt 1911 Government and Commander models
- Features: Witness holes, removable baseplate, steel spring and follower
- Approximate Weight: 0.2 lbs
What’s Included
- One 8-round stainless steel magazine with bumper pad
Frequently Asked Questions
Will this magazine work in both Government and Commander models?
Yes. The Government and Commander share the same grip frame and magazine well, so this eight-round magazine is fully compatible with both platforms. The Government has a five-inch barrel and the Commander has a 4.25-inch barrel, but they take the exact same magazines.
What's the difference between the 7-round and 8-round Colt magazines?
The seven-round magazine is flush-fitting and sits even with the grip. The eight-round magazine extends slightly below the grip. The extra round gives you more capacity, and many shooters prefer the eight-round for increased firepower. Both use the same stainless steel construction and are built to factory specifications.
Can I use this magazine in Officer model 1911s?
No. Officer models have a shorter frame and require shorter six or seven-round magazines. Using a full-length Government/Commander magazine in an Officer model can cause the magazine to bind and prevent the slide from closing when the pistol is locked open. Use only magazines specifically designed for the Officer frame.
How durable is the bumper pad on this magazine?
The polymer bumper pad is designed to absorb impact from drops and handling during tactical reloads. It protects both the magazine and whatever surface it might contact. Colt built this as a practical feature that makes the magazine more resilient while keeping the profile clean and functional.
Is this a factory original magazine or an aftermarket reproduction?
This is a genuine Colt factory magazine built to Colt specifications. It comes stamped with the Colt logo on the baseplate and is made with the same materials and processes as the magazines that ship with new Colt 1911 pistols. These magazines have a solid reputation for reliability and consistent feeding.
Do I need to break in a new magazine before using it?
No break-in period is necessary. Factory Colt magazines are ready to use right out of the box. Some shooters like to run them through a few cycles at the range to ensure their particular pistol feeds reliably with them, but this is more about testing your specific gun than breaking in the magazine.






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