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Most pistol-caliber AR builds lean on 9mm, but there's a loyal crowd that wants the bigger, slower thump of a .45 ACP. This adapter from Stern Defense scratches that itch by letting you feed Smith & Wesson M&P .45 ACP pistol magazines through a standard mil-spec AR-15 lower. It drops into the magazine well in seconds, no gunsmithing or permanent modification needed, and it keeps the familiar AR-15 controls you already know.
The body is machined from 6061-T6 aircraft-grade aluminum with a type 3 hard-coat anodized finish, so it holds up to real use without adding a bunch of bulk. Feeding is handled by a 4140 NiB-coated feedramp that helps rounds move smoothly and consistently. There's also a last-round bolt hold-open feature, which is a nice touch you don't always find on mag adapters and one that keeps reloads quick and the manual of arms intact. The magazine release is ergonomic and easy to reach, and the adapter plays nice with all generations of M&P magazines chambered in .45 ACP.
Worth knowing up front: this is a magazine well adapter, not a full caliber-conversion kit. To run it, your upper needs a dedicated .45 ACP barrel and a Glock-cut, bottom-feed bolt, and the ejection port should be opened up to clear the fatter .45 brass. On the buffer side, plan on an 11-ounce buffer or heavier when using a carbine spring to keep bolt speed in check. A tip that comes up often from folks running these: put a few drops of oil on the bolt hold-open mechanism before you install it, since they can ship a little stiff and dry.
Designed, machined, and assembled in the USA, the Mag-AD is a smart pick for range days, training, and specialty builds where you want the .45 ACP option without buying a whole new firearm. Pair it with a compatible upper and a set of M&P mags and you're in business.
It's built specifically for Smith & Wesson M&P pistol magazines chambered in .45 ACP, and it works with all generations of those mags. It does not accept Glock .45 magazines. If you already have M&P .45 mags on hand, you're set.
No, it's the magazine well piece of the puzzle, not a complete conversion. To actually fire .45 ACP you'll need an upper with a dedicated .45 ACP barrel, a Glock-cut bottom-feed bolt, and an enlarged ejection port to clear the wider brass. The adapter simply lets your mil-spec lower accept and feed the M&P magazines.
The adapter includes a mechanism that locks the bolt back after the final round, just like a standard AR-15 does with its own magazines. It keeps your reloads fast and your manual of arms familiar. A few drops of oil on the mechanism before install helps it move freely, since it can ship a little stiff.
When using a carbine spring, Stern Defense calls for an 11-ounce buffer or heavier to manage the added bolt velocity of the .45 ACP. Going too light can cause reliability and timing issues. Matching the right buffer to your setup is the key to smooth, consistent cycling.
| UPC | 850001176040 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 001SDMAGADMP45A |
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