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Stern Defense put this MOD5 upper together for folks who want a dedicated .45 ACP AR without piecing every part together themselves. It ships assembled and runs as a blowback pistol-caliber setup, feeding from Glock-pattern magazines through Stern's bottom-feed Glock-cut bolt. Pair it with a standard mil-spec AR-15 or M16 lower and the right buffer setup, and you've got a big-bore plinker that eats cheap handgun ammo and hits soft on the shoulder.
The heart of it is a 16.1-inch barrel machined from steel and finished in Black Melonite, which is a nitride treatment that fights corrosion and holds up to a lot of rounds. Up front sits Stern's SD CB45 compensator break to tame muzzle rise, while the free-float 15-inch M-LOK handguard gives you a long stretch of real estate for lights, grips, bipods, or a hand stop. The rail clamps on solid and stays put under hard use, and it's built light so the whole upper handles well.
The assembled receiver is 7075-T6 aluminum, hard-coat anodized, with an enlarged ejection port to clear those fat .45 cases. It comes with a laser-engraved dust cover and forward assist, plus mil-spec dry film lube already in the bore. The included SD BU45 bolt is 8620 steel with a mag-phosphate finish and a custom 4140 billet extractor, and it's cut to work with single-stage triggers that have short resets. It also plays nice with the Law Tactical folding stock.
This is a bottom-feed, Glock-cut system, so match it with a compatible Colt-style lower and skip anything nonstandard. Stern does not recommend the JP silent capture spring with .45, since the cartridge can beat up that system, and a good dead-blow style buffer like an H3 keeps bolt bounce in check on full-auto or heavy-use guns. Set it up right and this thing runs clean and reliable. It's a fun, low-cost way to shoot your AR with a caliber that's easy on the wallet and easy on your ears with the comp doing its work.
The included SD BU45 Glock-cut bolt is set up to run Glock-pattern .45 ACP magazines, and it also functions with Colt SMG magazines. If you'd rather run M&P .45 mags, Stern sells a separate MAG-AD conversion adapter for that. The bolt is a bottom-feed design, which is what makes reliable .45 feeding possible in an AR.
It ships fully assembled with the barrel, handguard, receiver, Glock-cut bolt, charging handle, and compensator all installed. You'll need a compatible mil-spec AR-15 lower and the correct buffer setup for a blowback .45 to complete the gun. Once it's mated to a lower, it's ready to run.
It's designed for standard AR-15 and M16 mil-spec upper receivers running Colt-style Glock-cut bolts. Stern specifically warns against Olympic Arms parts and notes that some dedicated PCC lowers, like certain Anderson models, have a nonstandard bolt catch height that can interfere. Stick with a standard mil-spec lower and you're good to go.
Black Melonite is a nitride surface treatment that hardens the steel and helps it resist corrosion and wear. It's a durable finish that holds up well to lots of rounds and rough conditions. The bore also comes with mil-spec dry film lube already applied from the factory.
| UPC | 850001176064 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 015SD15INCHMOD5MLOK161 |
| Action | |
| Barrel Finish | Black Melonite |
| Barrel Length | 16.1" |
| Caliber/Gauge | .45 ACP |
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