Description
The Archangel AA870 gives your Remington 870 12 gauge a full front-to-back makeover in one kit. Instead of the factory wood or hollow plastic furniture, you get a molded carbon-fiber reinforced polymer stock and forend built to shrug off weather, oils, and standard gun solvents. It's made in the USA and fits the Model 870 and clones that share the same receiver and slide dimensions.
What the AA870 Stock System Brings to the Table
The heart of the kit is a six-position collapsible buttstock that adjusts the length of pull from 11 to 14.25 inches, so it works whether you're running body armor, a heavy jacket, or handing it off to a smaller-framed shooter. ProMag uses a patented durometer tuning setup along with a tunable recoil pad that ships with both soft and firm inserts, letting you set up the feel you want. The teardrop-shaped extension tube gives you a natural cheek weld for bead or barrel-mounted sights, and the included detachable cheek riser raises your line of sight when you add an optic or raised sights.
Grip, Storage, and Rail Options on the AA870
Up front you get a textured ergonomic pistol grip with a locking internal storage compartment, handy for stashing spare parts, a battery, or a small tool. The military-length forend accepts two different caps: a smooth blank for a clean look, or a mini tri-rail so you can bolt on a Picatinny light, laser, or vertical grip. Molded-in QD sling swivel hardpoints sit on both the left and right sides for flexible carry, and ProMag backs the system with a limited lifetime warranty.
One thing worth knowing going in: installation takes a little patience. Most folks knock it out in 20 to 30 minutes, though the factory stock bolt can be stubborn and the bolt angle is sharp, so go slow to avoid cross-threading. Take your time and you'll have a rig that looks and handles like a completely different shotgun.
Key Specifications
- Manufacturer: ProMag
- MPN: AA870
- UPC: 708279010613
- Product Type: Stock System
- Fits: Remington Model 870 12 Gauge (and clones)
- Material: Carbon Fiber Reinforced Polymer
- Finish: Black
- Stock Positions: 6-Position Collapsible
- Length of Pull: 11 to 14.25 inches
- Grip Type: Ergonomic Pistol Grip with Storage
- Recoil Pad: Interchangeable Soft and Firm Inserts
- Forend: Military Length with Interchangeable Rail System
- Sling Mounts: Molded-In QD Hardpoints (Left and Right)
- Country of Origin: Made in USA
- Warranty: Limited Lifetime
What’s Included
- 6-position collapsible buttstock with pistol grip
- Military-length forend
- Interchangeable recoil pad with soft and firm inserts
- Detachable cheek riser
- Mini tri-rail forend cap
- Smooth blank forend cap
Frequently Asked Questions
Will the Archangel AA870 fit my Remington 870?
It's built for the Remington Model 870 in 12 gauge, along with clones that share the same receiver and slide tube dimensions. It's a complete kit, so both the buttstock and forend swap onto your existing shotgun. If you're running a 20 gauge, ProMag makes a separate model for that platform.
Is the AA870 stock system hard to install?
Most people get it mounted in about 20 to 30 minutes with basic hand tools. The main thing to watch is the factory stock bolt, which can be tight and sits at a sharp angle, so go slow to avoid cross-threading. Take your time and it goes on cleanly.
Can I mount a light or grip on the forend?
Yes. The forend comes with a mini tri-rail cap that gives you a section of Picatinny rail for a light, laser, or vertical grip. If you want a cleaner profile, there's also a smooth blank cap included that you can run instead.
Does the AA870 come with a shell carrier or optic?
No, this kit is the stock and forend system only. Sights and optics are not included, though the detachable cheek riser is there to help you line up with raised or optical sights once you add them. ProMag offers a separate receiver-mount shell carrier if you want extra onboard ammo.





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