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Brownells Ar-15 Mil-Spec Collapsible Stock Assembly Black
$65.19
$69.53
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The Brownells AR-15 mil-spec collapsible stock assembly is a drop-in buttstock solution built around the proven design of the US military M4 carbine. Whether you're running a rifle, carbine, or anything in between, this six-position adjustable stock lets you dial in the perfect length of pull for your frame, gear, and shooting style—critical if you swap between bare shooting and running body armor. It's the kind of foundational upgrade that transforms how an AR feels in your hands, and Brownells' version gives you the durability and fit you'd expect from a reputable parts supplier.
Installation is straightforward on any standard AR-15 lower receiver. The assembly comes complete with the buffer tube, receiver lock plate, lock nut, carbine recoil spring, buffer, and a steel sling loop welded to the stock for tactical or hunting carry. The buttstock itself is injection-molded nylon reinforced with fiberglass, engineered to shrug off impacts, temperature swings, moisture, and the corrosive effects of most gun cleaning solvents—important if you run this gun hard or in rough conditions. The stock interior is precision-matched to the mil-spec (1.14" O.D.) buffer tube, so you get a tight, rattle-free fit with no unwanted play.
The locking mechanism uses a steel nut with four square notches and factory-cut detents, designed to accept a stake for permanent lockup if you prefer. For most shooters, though, the detents hold position reliably through normal use. This is a no-frills, proven design—not exotic, just solid and functional.
Key Features
- Six-position length-of-pull adjustment to fit different shooter sizes and gear setups
- Mil-spec 1.14" O.D. buffer tube for compatibility with standard AR-15 lower receivers
- Complete assembly includes buffer tube, recoil spring, buffer, lock plate, and lock nut
- Toe-mounted steel sling loop for quick attachment options
- Fiberglass-reinforced nylon construction resists impact, heat, moisture, extreme cold, and cleaning solvents
- Precision-matched interior diameter eliminates rattle and play
- Four-square notch steel lock nut with pre-cut detents for optional staking
Specifications
| Product Name | Brownells AR-15 Mil-Spec Collapsible Stock Assembly |
| Brand | Brownells |
| Color | Black |
| Buffer Tube Diameter (O.D.) | Mil-Spec 1.14" |
| Length-of-Pull Positions | Six adjustable positions |
| Buttstock Material | Fiberglass-reinforced injection-molded nylon |
| Sling Attachment | Toe-mounted steel sling loop |
| Included Components | Buffer tube, receiver lock plate, lock nut, recoil spring, buffer, sling loop |
| Lock Mechanism | Steel nut with four square notches and pre-cut detents |
Frequently Asked Questions
Will this collapsible stock fit my AR-15 lower receiver?
Yes, as long as your lower receiver uses a standard AR-15 pattern, this mil-spec stock assembly will install directly. The mil-spec 1.14" O.D. buffer tube is the industry standard for AR-15 rifles and carbines.
What's included in the assembly?
The kit comes complete with the collapsible buttstock, mil-spec buffer tube, receiver lock plate, lock nut, carbine recoil spring, buffer, and a steel sling loop. You get everything needed for installation—no additional parts required.
Can I adjust the length of pull to fit body armor?
Yes. The six-position adjustment range is designed specifically to accommodate different shooter sizes and gear configurations, including body armor. This is one of the primary advantages of a collapsible stock over a fixed buttstock.
How durable is the nylon buttstock?
The buttstock is made from fiberglass-reinforced injection-molded nylon engineered to resist impact, heat, moisture, extreme cold, and most common gun cleaning solvents. It's built for hard use in a variety of conditions.
