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If you run a full-size Springfield Armory 1911 in .45 ACP and want more rounds in the tube without going the aftermarket route, the PI4521 is the direct answer. This is Springfield's own factory 10-round single-stack magazine, built to the same specs and materials as the magazines that come with the gun. The body is stainless steel, the spring is a stainless wire design, and a flat steel follower keeps rounds feeding at the correct angle on the way up.
The magazine features wide-cut witness holes down the side so you can get a fast round count at a glance, which is handy both at the range and any time you're staging the gun for home defense. The steel baseplate is clean and low-profile, so there's no extended bump below the magwell to catch on a holster or interfere with draw. The whole package is built the way you'd expect from a factory mag, not an economy aftermarket piece.
In terms of fit, this magazine is intended for Government and Commander model 1911s in .45 ACP with a standard single-stack frame. It will extend slightly below the magwell on some frames due to the additional round capacity, which is normal for any 10-round tube in a full-size grip. It's worth noting that this magazine is caliber and frame-size specific, so it won't work in the compact EMP or any of the 9mm or .38 Super 1911 variants in the Springfield lineup.
This is a solid pick whether you're stocking up on range mags, building a spare kit for your Mil-Spec or Loaded model, or just want to bump capacity without overthinking it. Springfield backs it with a limited lifetime warranty, the same as the rest of their magazine lineup.
Yes, the PI4521 is designed for full-size Springfield Armory 1911 pistols in .45 ACP, including Government and Commander frame variants like the Mil-Spec and Loaded. Because it holds 10 rounds instead of the standard 7 or 8, expect the baseplate to extend slightly below the magwell, which is normal for any extended-capacity 1911 mag.
The PI4521 is made for the standard single-stack Government and Commander 1911 platform, and that frame dimension is largely consistent across major manufacturers. Many 1911 owners report successfully running it in Colt, Kimber, and other standard full-size 1911 frames chambered in .45 ACP. That said, fit and function can vary depending on the individual pistol's tolerances, so it's always worth testing a new magazine with a range session before relying on it.
No, the PI4521 is sized for full-size Government and Commander length 1911 frames only. The EMP series uses a proprietary compact frame engineered around a different geometry, and a standard Government-length magazine will not function correctly in it. Always verify frame size and caliber before ordering.
The main difference is simply round count. The PI4521 gives you three additional rounds compared to a standard 7-round mag, and two over the common 8-round options. The trade-off is a slight extension below the magwell due to the longer tube. The construction materials, spring, and follower design are consistent across Springfield's stainless magazine lineup.
No, this magazine ships with a standard flat steel baseplate and no slam pad. It keeps a lower profile below the magwell compared to padded options, which suits users who want a clean look or prefer not to have extra bulk at the bottom of the grip.
| UPC | 706397645212 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | PI4521 |
| Brand Fit | Springfield Armory |
| Caliber/Gauge | .45 ACP |
| Capacity | 10 |
| Length | 9.7000 |
| Model | |
| Model Fit | 1911 |
| Package Height | 1.0 |
| Package Width | 4.0 |
| Product Type | Detachable |
| Shipping Weight | 0.2 |
| State Restriction (PR) | Puerto Rico |
| State Restriction (VI) | Virgin Islands |
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