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When it comes to compact 1911s, the magazine is one of those things you really don't want to guess on. The Officer and Defender frames run a shorter grip than a Government or Commander, and that means they need a magazine built specifically for that footprint. This is it. The Colt SP579991-RP is the factory original magazine for .45 ACP Officer and Defender pistols, made to the same specifications and tolerances as the mag your gun came with.
The body is laser-welded stainless steel with a polished finish, which gives it solid corrosion resistance and a clean look that holds up over time. Inside, you've got a high-tensile steel wire spring paired with a stainless steel follower for smooth, consistent round presentation. Numbered witness holes run along the side so you can check your round count at a glance without dropping the mag. The floor plate is a flush-fit steel design that keeps the profile tight, which matters if you're running this in a carry setup.
At 7 rounds of .45 ACP, you're getting the correct capacity for this platform without any compromises on fit. These aren't aftermarket approximations or generic 1911 mags that sort of work. They're built by Colt, in the U.S., for this exact application. If you own a Colt Defender or Officer and you're adding spares for training, rotating mags out of regular use, or just replacing a worn original, this is the straightforward answer.
Yes, the SP579991-RP is made specifically for Colt's compact 1911 platforms, including the Officer and Defender models chambered in .45 ACP. It will not fit full-size Government or Commander-length frames, which use a longer magazine. If you're unsure which size you have, the compact models typically feature a 3 to 3.5-inch barrel and a shorter grip.
This is a 100% genuine Colt factory magazine, not an aftermarket copy. It's manufactured by Colt's Manufacturing in the U.S. to the same specifications and materials as the magazine that originally shipped with your pistol. That means proper fit, correct spring tension, and reliable feeding right out of the box.
The body is constructed from laser-welded stainless steel with a polished finish, which resists corrosion and handles regular use well. The follower is also stainless steel, and the spring is high-tensile steel wire. These aren't materials that are going to give out on you quickly under normal use and proper maintenance.
Yes, it features numbered witness holes along the side of the body so you can do a quick visual check on how many rounds are loaded without removing the magazine. It's a small detail that comes in handy at the range and during reloads.
For range use, having two or three magazines gives you a smooth training session without constant reloading interruptions. For a carry setup, most people keep at least two or three on hand, rotating them so no single magazine stays under constant spring compression for extended periods. Having a fresh spare also means you're covered if one gets damaged or develops a feeding issue.
This magazine is specifically designed and spec'd for Colt Officer and Defender pistols. While some other mil-spec 1911 compact platforms may accept it, Colt specs and tolerances can vary from other manufacturers. For guaranteed fit and function, it's always best to confirm your pistol's magazine compatibility before purchasing.
| UPC | 098289900296 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SP579991-RP |
| Brand Fit | Colt |
| Caliber/Gauge | .45 ACP |
| Capacity | 7 |
| Color | Silver |
| Length | 6.5500 |
| Model | |
| Model Fit | 1911 Officer, Defender |
| Package Height | 1.0 |
| Package Width | 3.0 |
| Product Type | Accessory-Magazines |
| Quantity | 1 |
| Shipping Weight | 0.15 |
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