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The Colt Defender 9mm stainless magazine (MPN: SP300100-RP) is as straightforward as it gets: a genuine factory magazine made to the exact specs Colt uses in their own pistols. It fits the Defender, Officer, and New Agent 1911-style models, and because it comes from the same manufacturer as the gun itself, you are getting a piece that is tuned to the feed ramp geometry and timing of those platforms right out of the box.
Construction is all stainless steel, which matters more than people sometimes give it credit for. A carry magazine lives close to the body. It gets exposed to sweat, humidity, and the occasional rain. The stainless finish resists that kind of corrosion without any extra maintenance on your part, and it holds up to long-term storage just as well. The single-stack profile keeps the grip slim, which is the whole point of running a Defender in the first place.
Internally, you get a high-performance steel spring and a flat follower designed to feed smoothly and lock the slide back reliably on the last round. Precision-machined witness holes run along the body so you can check your round count at a glance without having to drop the mag. The flush-fit baseplate keeps the profile clean and carry-friendly, sitting right at the base of the grip without adding any unnecessary bulk.
Capacity is 8 rounds of 9mm Luger. That is a solid number for a subcompact single-stack, giving you a meaningful loadout without the magazine hanging past the grip. Whether you are building out a carry rotation, replacing a worn original, or just adding a spare to your range bag, this magazine is the most plug-and-play option available for these Colt compact platforms. No fitting, no guesswork.
This magazine is designed for Colt 1911-style compact pistols, specifically the Defender, Officer, and New Agent models chambered in 9mm. These are Officer-size frame guns, which use a shorter magazine than a full-size Government or Commander model. Do not expect this mag to fit a full-size 1911 flush.
The confirmed capacity for this specific part number (SP300100-RP, UPC 098289900531) is 8 rounds. Some retailer listings contain a data error showing 9 rounds, but the preponderance of authoritative sources, including multiple major retailers and Colt's own part specifications, confirm 8-round capacity.
Yes, this is a flush-fit magazine built to the same dimensions as the Defender's grip frame. It sits right at the base of the pistol without protruding below the grip, which is important for comfortable carry and a clean draw.
The factory magazine is built to the same tolerances and feed geometry that Colt used when engineering the Defender. That means the feed lips, spring tension, and follower angle are all matched to the gun's feed ramp from the start. Aftermarket magazines can work well, but when carry reliability is the priority, starting with the OEM magazine removes one variable from the equation.
Not really. Stainless steel is naturally resistant to corrosion from sweat, moisture, and humidity, which makes it a smart choice for a carry magazine. A quick wipe-down during routine cleaning is all it takes. You do not need to oil stainless magazines as heavily as blued or parkerized steel to keep rust at bay.
Most carry-minded folks run with at least two magazines: one in the gun and one spare. For a Defender used as an everyday carry pistol, having two or three of the same factory magazine means your reload is consistent and there is no mismatch in fit or timing between your primary and backup. Rotating magazines regularly also helps keep springs from taking a set.
| UPC | 098289900531 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SP300100-RP |
| Capacity | 9 |
| Caliber/Gauge | 9mm |
| Model | |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.2 |
| Package Width | 3.0 |
| Package Height | 0.7 |
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