If you’ve spent any time behind a UBR stock, you know the original polymer strike plate is the system’s Achilles’ heel. It’s the one piece that takes the brunt of the impact when you’re slamming the stock into position, and over time, that polymer can deform, crack, or just feel mushy. For the DIY enthusiast or the professional who demands repeatable, solid lock-up, that’s a problem waiting to happen. That’s why Magpul engineered this specific, drop-in solution: the Magpul UBR Strike Plate in aluminum. This isn’t a universal part; it’s a purpose-built, machined aluminum replacement designed to upgrade the durability and feel of your UBR stock’s locking mechanism from the inside out.
Miamishooterssupply is a Boise, ID-based retailer specializing in firearms parts and accessories for builders and enthusiasts. The Magpul UBR Strike Plate is a direct replacement for the polymer strike plate in Magpul’s UBR and UBR Gen2 stocks. This machined aluminum component provides a more durable and positive locking interface. It 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 This Part Actually Does
Let’s talk internals. The strike plate is the component inside the UBR stock’s adjustment lever assembly that the locking cam presses against to secure the stock in its extended position. Every time you deploy the stock, that cam slams into this plate. The factory polymer piece works, but aluminum changes the game. It eliminates flex, provides a harder, more consistent surface for the cam to engage, and transmits a more definitive “click” you can feel through the stock. From a gunsmith’s perspective, it’s about reducing wear on both the cam and the plate itself, ensuring the locking mechanism maintains its integrity for thousands of cycles.
Key Features & Build Quality
This is a straightforward upgrade, but the execution matters. Magpul didn’t just mill a block of aluminum; they replicated the OEM geometry exactly. This is critical for a drop-in part that interfaces with multiple other components. The installation requires no permanent modification—you’re simply swapping one plate for another. The black finish is a durable, hard-anodized type that matches the stock’s hardware and resists scratching during the install process.
The hardness of 6061-T6 aluminum versus the original polymer is the primary benefit. You’re trading a material with a degree of plasticity for one with superior yield strength. In practical terms, this means the locking point won’t gradually shift or become less positive as the polymer deforms under repeated impact. For law enforcement or anyone who trains frequently and relies on consistent stock deployment, this is a legitimate reliability upgrade, not just a cosmetic one.
I’ve handled a lot of aftermarket “upgrade” parts that promise the world but deliver fitment headaches. This Magpul part is different because it’s an OEM+ solution. It comes from the same company that designed the stock, so you get the assurance of perfect compatibility without the guesswork that comes with third-party manufacturers.
Pros and Cons
Pros:
- ✅ Direct OEM Replacement: Machined to Magpul’s exact specifications for a perfect, drop-in fit in UBR and UBR Gen2 stocks.
- ✅ Material Upgrade: 6061-T6 aluminum provides a significantly harder and more durable engagement surface than the factory polymer plate.
- ✅ Improved Tactile Feedback: Delivers a more positive and audible “click” when locking the stock into position.
- ✅ Enhances Long-Term Reliability: Reduces wear on both the strike plate and the locking cam, preserving the tight lock-up of the stock over time.
- ✅ Simple Installation: Requires only basic tools (a Torx driver) and can be installed in minutes without permanent gunsmithing.
Cons:
- ❌ Specific Use Case: Only works with the Magpul UBR/UBR Gen2 stock. It is not a universal part. If you need a different stock adapter, see our stock parts category.
- ❌ Adds Minimal Weight: The aluminum plate is slightly heavier than polymer, though the difference is negligible (approx. 0.4 oz).
- ❌ For Experienced Users: Installation involves disassembling the stock’s lever mechanism. If you’re not comfortable with that, you may need a local gunsmith.
Who Should Buy This (And Who Shouldn’t)
Buy the Magpul UBR Strike Plate if:
- You own a Magpul UBR or UBR Gen2 stock and want to upgrade its durability from the inside.
- You’re a frequent shooter who notices the factory polymer plate flexing or want a more definitive lock-up.
- You’re a builder or enthusiast who appreciates OEM-quality metal components over polymer in critical wear areas.
- You’re involved in duty or competition use where equipment reliability under repeated stress is non-negotiable.
Consider other options if:
- You have a different model of Magpul stock (like the CTR or STR) or a stock from another brand. This part is UBR-specific.
- Your factory polymer strike plate is functioning perfectly and you have no issues with stock lock-up. The upgrade is proactive, not always necessary.
- You are looking for a major external modification or aesthetic change. This is an internal functional upgrade.
Technical Specifications
| Product Type | Stock Component / Internal Upgrade Part |
|---|---|
| Material | 6061-T6 Aluminum |
| Manufacturing | CNC Machined |
| Finish | Black Hard Anodized |
| Hardness/Quality | Significantly harder and more wear-resistant than OEM polymer |
| Compatibility | Magpul UBR Stock, Magpul UBR Gen2 Stock |
| Installation/Usage | Direct drop-in replacement for factory polymer strike plate. Requires disassembly of stock adjustment lever. |
| Weight | Approximately 0.4 oz (11 g) |
| Dimensions | OEM-spec, matches factory part geometry |
| Country of Origin | USA |
| Condition | New in Package |
| SKU | MAG331 / 873750002057 |
How It Stacks Up: A Real Comparison
| Feature | Magpul UBR Strike Plate (Aluminum) | Generic Polymer Replacement (e.g., eBay/Amazon) | High-End Custom Machined (e.g., VLTOR, BCM) |
|---|---|---|---|
| Material | 6061-T6 Aluminum | Injection-Molded Polymer (often unspecified grade) | 7075-T6 or 6061 Aluminum, sometimes steel |
| Quality / Fit | OEM-spec, perfect fit guaranteed | Hit or miss; often requires filing/sanding | Excellent, but may be for specific custom stocks |
| Compatibility | Designed specifically for UBR/UBR Gen2 | May claim “universal” or incorrect fit | Often for proprietary systems or specific high-end stocks |
| Price Point | $$ (Mid-range, value-focused) | $ (Low cost, high risk) | $$$ (Premium, often part of a larger kit) |
| Lifespan/Durability | Long-term, wear-resistant upgrade | Similar to or worse than factory OEM | Long-term, but may be overkill for this application |
| Best For | UBR owners wanting a reliable, direct upgrade | Those replacing a broken part as cheaply as possible | Builders using niche stocks where this is the only option |
The takeaway? The Magpul aluminum strike plate sits in the sweet spot. It’s not the cheapest option, but you’re paying for guaranteed fit and material quality from the original manufacturer. It’s not an overly expensive custom piece, because for this specific function, 6061-T6 aluminum is more than sufficient. You avoid the fitment lottery of generic parts without paying a premium for capabilities you don’t need.
Frequently Asked Questions
Is the Magpul UBR Strike Plate compatible with the UBR Gen2 stock?
Yes. Magpul designed this aluminum strike plate to be a direct replacement for both the original UBR and the UBR Gen2 stock. The internal lever mechanism and strike plate geometry are identical between the two generations for this part.
What tools do I need for installation?
You will need a Torx T10 driver to remove the two screws on the adjustment lever housing. A small flat-head screwdriver or punch can help with pushing out the roll pin that holds the lever assembly together, though careful hand pressure is often enough. The process is straightforward and many detailed tutorials exist on popular gun channels.
Does this upgrade affect the stock’s adjustment or collapse function?
No. The part only replaces the internal plate that the locking cam engages. It does not alter the adjustment range, the number of positions, or the force required to collapse the stock. It solely improves the durability and feel of the lock-up in the extended position.
Will installing this void my Magpul warranty?
Typically, no. Replacing a wear component like the strike plate with another genuine Magpul component is generally considered acceptable maintenance and not a warranty-voiding modification. However, damage caused during improper installation would not be covered. Always refer to Magpul’s official warranty policy for the most current information.
Is the difference in feel really noticeable?
For most users, yes. The aluminum provides a more solid, less flexible base for the locking cam. This translates to a sharper, more authoritative “click” when the stock locks, both audibly and tactilely. If your original polymer plate has begun to deform, the difference will be very pronounced.
Where can I buy a Magpul UBR Strike Plate online?
You can purchase the genuine Magpul UBR Strike Plate, Aluminum, Black directly from Miamishooterssupply at miamishooterssupply.com. We stock this part and ship same-day from our warehouse in Boise, ID.
Do you offer any other internal upgrade parts for stocks?
Yes. We carry a variety of stock components, buffer tubes, locking mechanisms, and specialized hardware. Browse our full selection in the parts category for more options to upgrade your build.
✅ In stock — ready to ship today
✅ Same-day shipping from Boise, ID
✅ Discreet packaging on all orders
✅ 30-day returns on unused items
✅ Secure checkout with multiple payment options
Ready to upgrade your UBR’s lock-up? This Magpul UBR Strike Plate is a simple, effective way to enhance the durability and performance of your stock with a factory-direct part. Add it to your cart for a fast, secure checkout.
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About this review:</
Frequently Asked Questions About This Product
Why buy Magpul UBR Strike Plate, For UBR Stock, Aluminum, Black from Miami Shooters Supply?
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Where can I buy Magpul UBR Strike Plate, For UBR Stock, Aluminum, 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.
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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 Magpul UBR Strike Plate, For UBR Stock, Aluminum, Black
All firearms, including the Magpul UBR Strike Plate, For UBR Stock, Aluminum, 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 Magpul UBR Strike Plate, For UBR Stock, Aluminum, 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.
FFL Transfer & Firearms Laws
All firearms, including the Magpul UBR Strike Plate, For UBR Stock, Aluminum, Black, must be shipped to a licensed Federal Firearms License (FFL) dealer. A background check and any required local paperwork must be completed before you can take possession.
How It Works
- Place your order online.
- Send us your preferred local FFL dealer info.
- We ship the firearm to your FFL after verification.
- Complete background check and pick up from your dealer.
Legal Compliance
We comply with all U.S. firearm laws. It is your responsibility to ensure the Magpul UBR Strike Plate, For UBR Stock, Aluminum, Black is legal in your state. Some states (e.g. CA, NY, NJ) have restrictions on magazine size or certain features.
Helpful Links
Need help? Contact our team — we’ll guide you through selecting a compliant firearm and the FFL transfer process.
