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The Workhorse Complete Lower brings together solid engineering and practical features in one ready-to-go package. This isn't your basic budget lower—Battle Arms Development built it from aerospace-grade 7075-T6 aluminum and fitted it with enhanced controls designed to improve your shooting experience. The B5 Bravo stock included gets you off to a good start without the bulk or price tag of some alternatives.
Since this comes fully assembled, you're getting the trigger, safety, magazine catch, and all the internal components already installed and ready to function. The multi-caliber marking on the receiver means you can build it as a 5.56 NATO, .223 Rem, .300 Blackout, 7.62×39, or other compatible calibers by changing the upper receiver—that's the kind of versatility the AR platform is known for. The enhanced nickel-teflon trigger has a smooth break, and the enhanced bolt catch and magazine release button make reloads and malfunction drills faster. Every pin is enhanced and includes captured take-down pins, which makes assembly easier if you ever need to break it down.
The B5 Bravo stock is a step above what typically ships with budget lowers. It features an ergonomic cheek weld that puts your head naturally in the same position for every shot—accuracy and repeatability benefit from that kind of consistency. The stock is adjustable across six positions, has a cushioned buttpad that doesn't slip around, and includes a quick-detach sling mount. It's made from tough polymer with steel hardware, and the whole thing is mil-spec. The design removes unnecessary storage compartments to keep things lightweight and streamlined, which is why you see it on builds that prioritize function over features.
With a complete lower in hand, all you need is a compatible upper receiver and you've got a rifle. The Workhorse is marked for standard AR-15 uppers and is built to mil-spec tolerances, so compatibility with quality upper receivers shouldn't be an issue. At 2.3 pounds for the lower alone, it's not going to slow you down, and the type three hard anodized black finish resists corrosion and looks clean.
The Workhorse is built from aerospace-grade 7075-T6 aluminum with enhanced components throughout—trigger, safety, bolt catch, and magazine release are all upgraded versions. It uses mil-spec tolerances and captured take-down pins that make assembly easier. The overall engineering is designed for durability and reliability in active use.
Yes, the multi-caliber markings mean you can swap uppers to shoot different cartridges. The 5.56 NATO/.223 Rem are the standard, but you can build it for .300 Blackout, 7.62×39, and others—just change the upper receiver. The lower itself remains the same, which is the whole benefit of the AR platform.
The B5 Bravo brings real ergonomic improvements—the cheek weld is designed to put your head in the same position consistently, which improves accuracy. It's lighter and more compact than storage-style stocks, has a solid quick-detach mount for slings, and uses quality materials that won't rattle. For most builders, it's a practical step up without excessive cost.
Since this comes fully assembled, all you need is a compatible AR-15 upper receiver. Pair it with your upper, and you have a functioning rifle ready for an optic, handguard, and whatever else you want. No gunsmithing or assembly required on the lower itself.
Yes, the Workhorse is built to mil-spec tolerances and uses standard AR-15 magazine wells and receiver extensions. As long as upper receivers and accessories are quality mil-spec items, they'll work together without fitment issues.
You get the fully assembled lower receiver and the B5 Bravo stock. All internal components—trigger group, safety, magazine catch, buffer tube, and hardware—are already installed and ready to function. No additional parts or tools are included.
| UPC | 810033783913 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | WH-LR-R-B5 |
| Product Type | Complete Lower Receiver |
| Action | |
| Caliber/Gauge | Multi |
| Color | Black |
| Model |
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