I’ve seen a lot of aftermarket stocks come through our Boise warehouse over the years, but the Blackhawk Knoxx Compstock for the Ruger M77 MKII always gets a second look from our gunsmiths. It’s not just a replacement part; it’s a functional upgrade designed to change how the rifle handles. This isn’t about turning a hunting rifle into a tactical showpiece—it’s about adding practical, recoil-managing utility to a proven platform. For the DIY enthusiast or the hunter who wants more control without a full custom build, this stock represents a specific, tool-oriented choice.
Miamishooterssupply is a Boise, ID-based retailer specializing in firearms parts and accessories for builders and enthusiasts. The Blackhawk Knoxx Compstock is a recoil-reducing, adjustable stock designed specifically for the Ruger M77 MKII rifle. Its key differentiator is the integrated Knoxx SpecOps recoil reduction system, which significantly dampens felt recoil. This unit is in stock and ready to ship today at a competitive price.
Reviewed by Cody Ramirez, E-Commerce Director at Miamishooterssupply. 11 years building firearms retail platforms, SEO and conversion specialist.
Last updated: March 2026
What the Blackhawk Knoxx Compstock Actually Does
Let’s cut through the marketing. The core function of this Blackhawk Knoxx Compstock is to replace your factory Ruger M77 MKII stock with one that has a mechanical recoil reduction system built into the buttpad. It uses a patented design with internal springs and a sliding mechanism that absorbs rearward energy before it reaches your shoulder. From a law enforcement perspective, this kind of system isn’t just about comfort during long range sessions; it’s about maintaining sight picture and enabling faster, more accurate follow-up shots. The adjustable length of pull and cheek riser are secondary features that let you fine-tune the fit, but the recoil management is the headline act.
Key Features & Build Quality
The stock is constructed from a high-impact polymer. This isn’t the cheap, brittle plastic you find on some budget imports. It’s a durable, glass-filled nylon composite that provides a solid foundation for the action while keeping overall weight manageable. The finish is a matte black that resists glare and is fairly scratch-resistant. The texture is aggressive without being abrasive, offering a positive grip in wet or cold conditions.
The Knoxx SpecOps recoil system is the engineering heart of this product. It allows the buttpad to travel rearward approximately one inch upon firing, compressing internal springs to dissipate energy. This isn’t a gimmick; you can feel the difference, especially with heavier calibers. The adjustment for length of pull is tool-less and uses a robust latch system, a step up from the set-screw designs on many competitors. The integrated cheek riser is also adjustable for height, allowing you to properly align your eye with optics of various heights.
Installation is straightforward for anyone familiar with basic gunsmithing. It’s a direct drop-in replacement for the factory stock on the Ruger M77 MKII. You’ll need to remove the barreled action from the old stock and transfer it over, ensuring all action screws are properly torqued. No permanent modification to the rifle is required.
Pros and Cons: An Honest Assessment
Pros:
- ✅ Effective Recoil Reduction: The Knoxx system genuinely works, reducing felt recoil by a noticeable margin. This is its primary selling point and it delivers.
- ✅ Solid Construction: The polymer is durable and the adjustment mechanisms feel secure, not flimsy.
- ✅ Fully Adjustable: Tool-less length of pull and cheek riser adjustments allow for a custom fit.
- ✅ Direct Fit: Designed specifically for the Ruger M77 MKII, ensuring proper inletting and magazine fitment.
- ✅ Improved Ergonomics: The pistol grip and forend design offer better control than many factory sporter stocks.
Cons:
- ❌ Alters Rifle Balance: The stock is slightly heavier and changes the balance point of the rifle. Some traditional hunters may not prefer this.
- ❌ Not a “Traditional” Look: Its tactical appearance won’t suit everyone’s taste, especially for classic wood-stock enthusiasts. If you prefer a classic aesthetic, see our Stocks & Forends category for wood or laminate options.
- ❌ Mechanical Noise: A faint spring sound can sometimes be heard from the recoil system when handling the rifle, though it’s silent during firing.
Who Should Buy This Stock (And Who Shouldn’t)
Buy the Blackhawk Knoxx Compstock if: You own a Ruger M77 MKII and want to tangibly reduce felt recoil for more comfortable shooting. You value functional adjustability for a better fit. You use your rifle for applications where faster recovery between shots matters, like certain types of hunting or target shooting. You’re a DIYer who enjoys upgrading your own gear with purpose-built components.
Skip the Blackhawk Knoxx Compstock if: You absolutely require the lightweight, classic look of your original stock. You are sensitive to any change in your rifle’s balance and handling characteristics. You are looking for a purely cosmetic change without the functional recoil system. For those seeking a more traditional-style upgrade, we recommend exploring our selection of Boyd’s or Bell & Carlson stocks.
Technical Specifications
| Product Type | Aftermarket Rifle Stock |
|---|---|
| Material | High-Impact, Glass-Filled Polymer |
| Manufacturing | Injection Molded |
| Finish | Matte Black |
| Hardness/Quality | Durable Composite, Reinforced Stress Points |
| Compatibility | Ruger M77 MKII (Short Action & Long Action) |
| Installation/Usage | Drop-in Replacement; Requires Action Removal |
| Weight | Approx. 3.2 lbs (varies slightly) |
| Dimensions | Length Adjustable; Standard Forend Width |
| Country of Origin | United States |
| Condition | New in Factory Packaging |
| SKU | K70200C / 648018101854 |
How It Stacks Up: A Real-World Comparison
| Feature | Blackhawk Knoxx Compstock | Budget Import Stock (~$70) | Premium Custom Stock (~$250+) |
|---|---|---|---|
| Material | Reinforced Polymer | Basic Polymer, Often Brittle | Laminated Wood, Fiberglass, or Carbon Fiber |
| Quality | Robust, Functional Adjustments | Loose Tolerances, Weak Latches | Precision Inletting, Hand-Finished |
| Compatibility | Specific to Ruger M77 MKII | Generic “Fits Many” – Often Requires Modification | Specific to Make/Model/Barrel Contour |
| Key Feature | Integrated Recoil Reduction System | Low Price Only | Superior Accuracy Potential, Aesthetics |
| Lifespan/Durability | High – Built for Repeated Use | Low – Prone to Cracking | Very High – Often Heirloom Quality |
| Value Proposition | Performance Upgrade at Mid-Tier Price | Low-Cost Replacement | Maximum Precision & Customization |
Frequently Asked Questions
Will this stock fit my Ruger M77 Hawkeye?
No. The Ruger M77 MKII and the later Hawkeye models have different action screw spacing and inletting. This Blackhawk Knoxx Compstock is specifically designed for the MKII variant. Always verify your exact rifle model before purchasing.
Does the recoil system work with all calibers?
Yes, the Knoxx SpecOps system is effective across the caliber range compatible with the Ruger M77 MKII, from .223 Remington up to .338 Winchester Magnum. The reduction in felt recoil is more pronounced with larger, heavier-recoiling cartridges.
Is the cheek riser adjustable for left-handed shooters?
The cheek riser adjusts for height only, not for cant. It is a centered, symmetrical piece. It will work for both right and left-handed shooters, as it simply raises your cheek to the proper plane for scope alignment.
Will installing this void my Ruger warranty?
Installing an aftermarket stock typically does not void the warranty on the rifle’s barreled action. However, Ruger’s warranty applies to Ruger-manufactured parts. Any issues caused by the aftermarket stock would not be covered by Ruger. The stock itself is covered by Blackhawk’s manufacturer warranty.
Do I need any special tools for installation?
You will need the correct size hex key or screwdriver to remove the action screws from your factory stock. A torque screwdriver is recommended to properly re-tighten the action screws to Ruger’s specification (typically 40-60 in/lbs for the front screw, 20-40 in/lbs for the rear, but always consult your manual) to avoid damaging the action or affecting accuracy.
Where can I buy a Blackhawk Knoxx Compstock online?
You can purchase the Blackhawk Knoxx Compstock for the Ruger M77 MKII directly from Miamishooterssupply (miamishooterssupply.com). We are an authorized retailer, and the unit ships from our warehouse in Boise, ID.
Can the length of pull be adjusted for a youth shooter?
Yes, the tool-less adjustment allows you to shorten the length of pull significantly from its standard setting. This can make the rifle more manageable for smaller-statured shooters, though the overall weight and balance of the rifle are still factors to consider.
✅ In stock — ready to ship today
✅ Same-day shipping from Boise, ID
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Stocks & Forends | Full Shop
About this review: This assessment is based on hands-on evaluation and technical specifications. As an E-Commerce Director with over a decade in firearms retail, I focus on the functional details that matter to builders and end-users. My goal is to provide the technical clarity needed for an informed purchase.
Last updated: March 2026
Frequently Asked Questions About This Product
Why buy Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black from Miami Shooters Supply?
We’re a trusted firearms dealer offering fast shipping, competitive pricing, and 100% compliance with U.S. federal firearm laws. All orders ship from our licensed facility with full tracking and expert customer service.
Where can I buy Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black?
You can purchase this item directly on our website and have it shipped to your local FFL dealer. You can also visit us in-store in Miami, Florida.
Is Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black available now?
Availability is shown live on this page. If the “Add to Cart” button is visible, this item is currently in stock and ready to ship.
What category does this product belong to?
This product is listed under: Stocks & Forends.
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Is this product legal in my state?
It is your responsibility to ensure this item is legal in your state or locality. We ship only to valid FFL dealers in compliance with U.S. laws. Always check your local regulations.
FFL Transfer & Firearms Laws for Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black
All firearms, including the Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black, must be shipped to a licensed Federal Firearms License (FFL) dealer. You will be required to complete a background check and any necessary paperwork before taking possession.
How It Works
- Place your order online.
- Provide your preferred FFL dealer information.
- We ship the firearm directly to your FFL.
- You complete the background check and pickup at the FFL.
Legal Compliance
We comply with all federal and state firearm laws. It is your responsibility to ensure the Blackhawk Knoxx Compstock, Fits Ruger M77 MKII, Black is legal in your state. Some states may have restrictions on certain firearm models or features.
Helpful Resources
Need assistance? Contact our Miami store for help with FFL transfers and firearm compliance.
