Remington 700 Universal Mini Chassis Installation Explainer

HOW TO INSTALL THE GRAYBOE UNIVERSAL MINI CHASSIS (UMC)

The Grayboe Universal Mini Chassis (UMC) is designed to give shooters a rigid, repeatable, metal-to-metal interface without the need for bedding or gunsmith work. Whether you’re upgrading from a factory stock or switching from another chassis system, installation is straightforward and can be completed in minutes.

This guide covers everything you need to know—from tools and hardware to torque values and magazine fitment.

COMPATIBLE ACTIONS

The Grayboe UMC is compatible with true Remington 700 footprint actions, including:

Remington 700 (Short & Long Action)

Defiance

Lone Peak

Terminus

Zermatt (Zerat)

Mack Bros

Bergara B-14

Other true R700 clones

If your action fits a Remington 700 inlet, it will fit the UMC.

WHAT COMES IN THE BOX

Each Universal Mini Chassis ships with:

Universal Mini Chassis (UMC)

UMC-to-stock mounting screws

Long Action: one short front screw, one longer rear screw with washers

Short Action: both screws are the same length

Action screws (barreled action to chassis)

Optional magazine stop roll pin

All hardware is clearly labeled for easy identification.

TOOLS REQUIRED

You’ll only need basic hand tools:

5/32" Allen key (UMC to stock)

3/16" Allen key (action screws)

Inch-pound torque wrench (recommended)

STEP 1: INSTALL THE MINI CHASSIS INTO THE STOCK

Drop the Universal Mini Chassis into the stock inlet making sure it sits fully flush.

Install the UMC-to-stock screws:

Long Action: short screw with washer in front, long screw with washer in the rear

Short Action: either screw can be used front or rear

Torque both screws to 60 inch-pounds.

STEP 2: REMOVE FACTORY STOCK COMPONENTS

Remove your barreled action from its factory stock. Factory bottom metal such as BDL floorplates or ADL blind magazines are not reused with the UMC system.

The Universal Mini Chassis replaces all factory bottom metal.

STEP 3: INSTALL THE BARRELED ACTION

Set the barreled action into the installed mini chassis. Install the two supplied action screws (same length front and rear).

Torque both action screws to 45 inch-pounds.

STEP 4: MAGAZINE FIT AND FUNCTION CHECK

Insert an AICS-pattern magazine and verify proper fit.

Long Action UMCs accept CIP-length 3.850” AICS magazines

Confirm smooth bolt travel and reliable feeding

OPTIONAL: MAGAZINE STOP INSTALLATION

Most AICS magazines do not require a magazine stop. If you experience excessive upward magazine movement, install the supplied roll pin into the side hole of the UMC to limit upward movement.

If your magazine locks up cleanly without it, the pin is not needed.

ALTERNATE INSTALLATION METHOD

You may also install the barreled action into the mini chassis first, then place the complete assembly into the stock and secure it with the UMC screws. Both methods are equally valid.

WHY THE GRAYBOE UMC IS DIFFERENT

No bedding required

No factory bottom metal

Predefined torque specs

Rigid aluminum chassis molded into the stock

AICS magazine compatibility

Repeatable accuracy and durability

Ultimate rifle compatibility.

FINAL THOUGHTS

The Grayboe Universal Mini Chassis makes upgrading your rifle simple, strong, and repeatable—without the cost or hassle of traditional bedding. If you have questions, Grayboe support is always ready to help.