Transform your Ruger 10/22 into a modern, tactical-style rimfire platform with the FAB Defense M4 Conversion Kit Chassis (FXM4R1022B, UPC: 7290105943668). Designed to deliver an AR-inspired look and improved modularity, this black chassis conversion kit includes an adjustable folding GL-CORE stock, an ergonomic finger groove pistol grip, and Picatinny accessory rails for mounting lights, grips, bipods, and other upgrades. Best of all, it’s built to fit Ruger 10/22 rifles with both standard and bull barrels, making it an excellent choice for shooters who want one chassis that supports multiple 10/22 configurations.
If you’re searching for a Ruger 10/22 tactical chassis, a 10/22 M4-style conversion kit, or FAB Defense FXM4R1022B, this kit is a standout option for upgrading ergonomics, accessory capability, and overall “modern rimfire” versatility.
Give Your Ruger 10/22 a Modern M4-Style Feel
The Ruger 10/22 is one of the most popular .22 LR rifles ever made because it’s reliable, customizable, and incredibly fun to shoot. This FAB Defense conversion kit takes that proven action and places it into a chassis that feels more like a modern sporting rifle—ideal for:
Tactical-style rimfire training
Range plinking with accessories
Rimfire steel and speed drills
Building a trainer that mirrors your centerfire setup
Giving a classic 10/22 a fresh, modern identity
Whether you want a dedicated training rifle or a standout range build, the M4 conversion style adds capability and style in one upgrade.
Fits Ruger 10/22 Standard and Bull Barrels
One of the biggest advantages of this chassis is broad compatibility. It’s designed to fit Ruger 10/22 rifles with both standard and bull barrels, which means:
You can use it with a factory-profile 10/22
It can support heavier bull-barrel setups for improved stability
It’s a smart choice if you own multiple 10/22 builds
You don’t have to limit your upgrades to one barrel style
This flexibility makes the kit a strong long-term investment for serious 10/22 enthusiasts.
Adjustable Folding GL-CORE Stock: Compact Storage and Better Fit
The included GL-CORE stock brings major functional upgrades to your rimfire rifle. It’s adjustable for length of pull, which helps tailor fit for different shooters and shooting styles, and it folds for easier transport and storage.
Benefits of an adjustable folding stock on a 10/22 chassis
More comfortable fit for different body sizes
Easier handling in tight spaces or transport cases
Compact storage for backpacks, range bags, or vehicle setups
Better ergonomics for optics-equipped rimfire builds
If you’ve ever wished your 10/22 fit more like your AR, this stock design helps close that gap.
Finger Groove Pistol Grip: Ergonomic Control and Familiar Handling
This kit includes a finger groove pistol grip, providing a more secure, comfortable interface—especially during:
A pistol grip also offers a familiar feel for shooters who train with AR-platform rifles, making this conversion kit especially valuable as a rimfire trainer.
Picatinny Accessory Rails: Build the Rimfire You Actually Want
The M4 Conversion Kit Chassis features Picatinny accessory rails, letting you customize your setup with common add-ons such as:
Weapon lights and laser units (where legal and appropriate)
Vertical grips or angled grips
Bipods for prone and bench shooting
Sling mounts and accessory hardware
Other Picatinny-compatible upgrades
This rail-ready configuration makes it easy to tailor your 10/22 for plinking, training, small-game utility (where legal), or competitive rimfire applications.
Black Chassis Styling: Modern Look, Practical Finish
The black finish provides a clean, modern aesthetic that pairs well with most optics and accessories. It’s also practical—black gear tends to:
Hide scuffs and normal wear better
Match common accessory colors
Fit in with tactical-style builds and training rigs
Stay visually consistent as you add upgrades over time
If you want a cohesive, modern rimfire build, this chassis provides a strong foundation.
Ideal for Training, Plinking, and Rimfire Competition-Style Fun
This conversion kit is an excellent fit for:
Shooters who want a 10/22 that mimics AR ergonomics
Range users who enjoy building accessory-ready rimfires
Trainers who want low-cost repetition with a familiar feel
Rimfire steel and action-style drills where modularity matters
Anyone who wants to modernize a 10/22 without buying a new rifle
It’s also a great way to refresh an older 10/22 and turn it into a totally different experience.
Product Details and SEO Search Terms (Easy Reference)
To ensure you’re matching the exact model:
Brand: FAB Defense
Product Name: M4 Conversion Kit Chassis
Color: Black
Stock: Adjustable Folding GL-CORE
Grip: Finger Groove Pistol Grip
Rails: Picatinny Accessory Rails
Fitment: Ruger 10/22 (Standard & Bull Barrels)
Model / Part Number: FXM4R1022B
UPC: 7290105943668
Common searches: FAB Defense 10/22 chassis, M4 conversion kit Ruger 10/22, FXM4R1022B, 10/22 tactical folding stock chassis, 7290105943668
A Complete Tactical Chassis Upgrade for the Ruger 10/22
If you want to modernize your Ruger 10/22 with improved ergonomics, modular accessory capability, and an AR-inspired feel, the FAB Defense M4 Conversion Kit Chassis (FXM4R1022B / 7290105943668) is a powerful upgrade. With its adjustable folding GL-CORE stock, finger groove pistol grip, and Picatinny accessory rails—plus compatibility with standard and bull barrels—it gives you the freedom to build the rimfire rifle you actually want to shoot, train with, and show off.
The End
