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Brownells
The Brownells AR-15 collapsible commercial stock assembly gives you the versatility of a modern M4-style carbine setup on your rifle. This six-position adjustable buttstock lets you dial in the length of pull that works for your frame, gear, and shooting style—whether you're running body armor, heavy winter layers, or just need a shorter pull for better control. It's a straightforward upgrade for any AR-15 on a standard commercial buffer tube, and it arrives complete with everything needed for installation: the tube itself, receiver lock plate, lock nut, recoil spring, buffer, and a steel sling loop mounted at the toe.
Built from fiberglass-reinforced injection-molded nylon, this stock is engineered to take a beating. It resists impact, temperature swings from heat to extreme cold, moisture, and the solvents you'll throw at it during cleaning. The interior is precisely matched to the buffer tube O.D., which means zero rattle and no play—important if you care about a tight, quiet setup. The included aluminum receiver extension is machined and hardcoat anodized to military standards, and the steel lock nut features four square notches with pre-cut detents so you can stake it solid once you've found your preferred position.
This is a proven, no-nonsense upgrade path if you're converting a fixed-stock rifle to a modern carbine configuration without permanent modifications to the receiver. Install it, adjust it to fit, and get to work.
| Brand | Brownells |
| Product Type | Collapsible Stock Assembly |
| Buffer Tube Diameter | 1.17 inches (commercial) |
| Adjustment Positions | Six |
| Stock Material | Fiberglass-reinforced injection-molded nylon |
| Receiver Extension Material | Machined aluminum, hardcoat anodized |
| Included Components | Buttstock, 1.17" buffer tube, receiver lock plate, lock nut, recoil spring, buffer, steel sling loop |
| Compatibility | Standard AR-15 lower receivers (commercial tube) |
| Color | Black |
Yes, this stock assembly is designed for any AR-15 lower receiver that accepts a commercial-diameter buffer tube. It includes the tube and all hardware needed for installation.
This assembly uses a commercial-diameter tube (1.17 inches O.D.). Commercial and mil-spec tubes are not interchangeable, so confirm your receiver's compatibility before purchase. If your rifle currently has a fixed stock and you're unsure, a commercial tube is the standard choice for most modern AR platforms.
Yes. The assembly includes the collapsible stock, 1.17-inch commercial buffer tube, receiver lock plate, lock nut, recoil spring, buffer, and a steel sling loop. You'll need basic tools (screwdriver, wrench) but no additional parts.
Yes. The six adjustment positions are designed to accommodate different gear configurations, including body armor. You can dial in a longer pull for comfort or a shorter pull depending on what you're wearing.
Brownells
The Brownells AR-15 collapsible commercial stock assembly gives you the versatility of a modern M4-style carbine setup on your rifle. This six-position adjustable buttstock lets you dial in the length of pull that works for your frame, gear, and shooting style—whether you're running body armor, heavy winter layers, or just need a shorter pull for better control. It's a straightforward upgrade for any AR-15 on a standard commercial buffer tube, and it arrives complete with everything needed for installation: the tube itself, receiver lock plate, lock nut, recoil spring, buffer, and a steel sling loop mounted at the toe.
Built from fiberglass-reinforced injection-molded nylon, this stock is engineered to take a beating. It resists impact, temperature swings from heat to extreme cold, moisture, and the solvents you'll throw at it during cleaning. The interior is precisely matched to the buffer tube O.D., which means zero rattle and no play—important if you care about a tight, quiet setup. The included aluminum receiver extension is machined and hardcoat anodized to military standards, and the steel lock nut features four square notches with pre-cut detents so you can stake it solid once you've found your preferred position.
This is a proven, no-nonsense upgrade path if you're converting a fixed-stock rifle to a modern carbine configuration without permanent modifications to the receiver. Install it, adjust it to fit, and get to work.
| Brand | Brownells |
| Product Type | Collapsible Stock Assembly |
| Buffer Tube Diameter | 1.17 inches (commercial) |
| Adjustment Positions | Six |
| Stock Material | Fiberglass-reinforced injection-molded nylon |
| Receiver Extension Material | Machined aluminum, hardcoat anodized |
| Included Components | Buttstock, 1.17" buffer tube, receiver lock plate, lock nut, recoil spring, buffer, steel sling loop |
| Compatibility | Standard AR-15 lower receivers (commercial tube) |
| Color | Black |
Yes, this stock assembly is designed for any AR-15 lower receiver that accepts a commercial-diameter buffer tube. It includes the tube and all hardware needed for installation.
This assembly uses a commercial-diameter tube (1.17 inches O.D.). Commercial and mil-spec tubes are not interchangeable, so confirm your receiver's compatibility before purchase. If your rifle currently has a fixed stock and you're unsure, a commercial tube is the standard choice for most modern AR platforms.
Yes. The assembly includes the collapsible stock, 1.17-inch commercial buffer tube, receiver lock plate, lock nut, recoil spring, buffer, and a steel sling loop. You'll need basic tools (screwdriver, wrench) but no additional parts.
Yes. The six adjustment positions are designed to accommodate different gear configurations, including body armor. You can dial in a longer pull for comfort or a shorter pull depending on what you're wearing.
