Tech Tip - Midwest Industries Remington 870 Stock Install

In this Brownells Tech Tip, Caleb walks viewers through the complete installation of the Midwest Industries modular stock system for the Remington 870 shotgun. This comprehensive guide is perfect for those looking to upgrade their shotgun for enhanced ergonomics, modularity, and a more tactical configuration. Whether you're working with an 870 or a Mossberg 500/590, the process is nearly identical.

What You Will Learn

Viewers learn to use specialized tools (e.g., torque wrench, Magna-Tip screwdriver), apply pro tips (e.g., thread locker, handling rusted bolts), and understand the stock’s components (e.g., cheek riser, M-LOK slots). The video emphasizes safety, proper preparation, and the upgrade’s benefits, such as improved durability, sight alignment, and accessory compatibility for defensive or range use. This clear, hands-on tutorial equips viewers to confidently upgrade their shotgun while avoiding common errors.

Benefit 

Watching this video equips viewers with the knowledge and confidence to upgrade their Remington 870 (or Mossberg 500/590) with a tactical, modular stock. The clear visual demonstration, combined with Caleb’s expert guidance, makes the process accessible to first-time DIYers and seasoned gunsmiths alike.

Introduction

Caleb opens the video with a quick overview of the project: installing the Midwest Industries stock on a Remington 870. He sets expectations early—this isn’t an unboxing video or gear review. Instead, it’s a hands-on tutorial for those who want to do the work themselves.

Tools Used

Caleb uses the Fix It Sticks Field Armorer’s Kit and the Brownells Magna-Tip screwdriver system, which he praises as one of the best screwdrivers for gunsmithing. He also makes use of a Brownells vise, calling it the best in the business for firearms work.

Unboxing the Stock Components

Though he skips the unboxing, Caleb provides a rundown of what comes with the Midwest Industries stock kit:

• Skeletonized stock with adjustable and reversible cheek riser

• Grip module that mounts between the stock and adapter

• Receiver adapter marked specifically for the Remington 870 (or Mossberg 500/590 variants)

• Hardware pack with screws and optional thread locker

Removing the Factory Stock

After ensuring the shotgun is completely unloaded, Caleb mounts it upside down in the vise to begin removing the original wood stock.

Removing the Rubber Recoil Pad

Using a special Magne-Tip recoil pad bit, Caleb demonstrates how to carefully remove the screws hidden beneath the rubber buttpad. He recommends applying a bit of gun oil to the screwdriver to help it slide through the rubber without damage.

Removing the Stock Bolt

Down inside the stock is a slotted bolt (on the 870; Mossbergs may use a hex bolt). Caleb uses a long Magne-Tip driver to remove it, offering a pro tip: if the bolt is rusted, tap the back of the screwdriver while applying forward pressure to help break it loose.

Once removed, he sets aside the stock bolt, washer, and rear support plate (common on wood stocks) and reassembles them for safekeeping.

Installing the Adapter Plate

The Midwest Industries adapter is marked clearly for the Remington 870 and fits snugly into the rear of the receiver.

Installing the Main Adapter Bolt

Caleb uses the included bolt to attach the adapter plate, tightening it down with a 3/16 hex driver. He uses a Brownells torque wrench to tighten the bolt to 50 inch-pounds, then backs the wrench down to 10 inch-pounds for the remaining fasteners.

Mounting the Grip Module

The grip module slides onto the adapter in one direction only, making installation foolproof. Caleb applies Vibra-Tite thread locker to the screws before securing the grip to the adapter with four bolts—two on each side.

Installing the Stock Section

The skeletonized stock section is then inserted into the grip module, locking into place. Caleb points out that the screw pattern is asymmetrical, so pay close attention during this step. Like before, he uses Vibra-Tite and torques the screws down evenly.

Installing the Grip Panels

Included in the kit are polymer grip panels to cover the sides of the grip module. Caleb installs these next but also mentions that G10 grip panel upgrades are available from Midwest Industries.

Each panel is secured with two screws. Caleb torques them down to 10 inch-pounds and notes that applying thread locker is a good idea here as well.

Reversing the Cheek Riser for Left-Handed Use

Being left-handed, Caleb flips the cheek riser to the left side. The riser is reversible, making it versatile for left- or right-handed shooters. He notes that if you’re running an optic, you can raise the riser to improve your cheek weld.

Optional Shell Holder

Caleb closes out the install by showing an optional M-LOK-mounted shell holder that fits directly onto the stock. It’s a great addition for those looking to carry extra rounds on the gun.

Final Thoughts

The Midwest Industries stock for the Remington 870 offers a durable, modular, and ergonomic upgrade over factory stock options. With features like an adjustable cheek riser, M-LOK compatibility, and solid construction, it’s a fantastic option for both defensive and range applications.

Caleb's straightforward installation guide ensures that even first-time DIYers can tackle this project with confidence.

For more guides, tools, and shotgun upgrades, visit Brownells.com.

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