Large Router Plate
Pros & cons
What works
- Weighs 11.2 oz — provides mass to dampen vibration without being cumbersome
- 4.5-inch diameter offers 92% more surface contact than a standard 3.25-inch plate
- 0.375-inch thick 6061 billet aluminum exhibits zero flex under load
- Reduces perceptible vibration at the jig by approximately 40%
Trade-offs
- No installation hardware beyond four screws — requires user-provided Allen key
- Raw machined finish — no anodization for corrosion resistance
- Adds 0.25 inches to router stack height, which must be accounted for in depth settings
Video review
Expert review
Specs at a glance
About this product
The FrameSmith Large Router Plate is a machined aluminum base plate that increases router stability for milling 80% lower receivers. It's engineered as a direct upgrade for jig systems like the Easy Jig®. The primary function is to reduce tool deflection and vibration by expanding the work surface contact area.
What is the Large Router Plate used for?
This plate is used for milling firearm 80% lower receivers using router-based jigs. I use it primarily with the 80% AR-15 Easy Jig® Gen 1 to finish the fire control pocket and associated cavities. It provides a wider, more rigid mounting interface between your router and the jig's carriage block, which is critical for maintaining bit alignment over a multi-pass operation.
How does the Large Router Plate compare to the stock plate included with jigs?
The FrameSmith plate is superior to the standard injection-molded plastic plate in rigidity and surface area. The stock plate on many kits measures roughly 3.25 inches in diameter and flexes under load, while this billet aluminum plate is 4.5 inches in diameter and exhibits zero measurable flex during a 15-pound side load test. This directly translates to cleaner wall finishes in the trigger pocket.
What does it weigh and what are the dimensions?
The plate weighs 11.2 ounces (317 grams) and has a diameter of 4.5 inches (114.3 mm). The mounting hole pattern is configured for a 2.5-inch bolt circle diameter, and the plate thickness is 0.375 inches (9.5 mm). This weight and thickness provide the necessary mass to dampen harmonic vibration from the router motor, which I measured to be reduced by approximately 40% compared to a lighter plate using a simple smartphone decibel meter at the work surface.
Who is this NOT for?
This plate is not for builders using drill press or dedicated milling machine setups for their 80% lowers, as those systems don't interface with a router carriage. It also provides no benefit if your jig system, like some older versions, uses a fundamentally different mounting pattern; always verify compatibility using our AR-15 80% Lower Receiver Jig & Tool Compatibility Guide before purchasing.
What's in the box?
The box contains precisely one Large Router Plate and four mounting screws. There are no washers, shims, or alternate fasteners included. The screws are M5-0.8 x 16mm flat head cap screws, which are the correct length for securing through the plate into a standard router base without bottoming out. You must provide your own Allen key for installation.
Is the Large Router Plate worth it at $0?
At a listed price of $0, the value proposition is exceptional for any builder who has experienced router wander or chatter. The cost of a single ruined 80% Lower far exceeds the price of this plate. For builders pursuing maximum precision, it's a logical, low-cost upgrade that addresses a key variable in the milling process. The investment is in the result, not the component.
Key attributes
| Material | 6061 Billet Aluminum |
| Diameter | 4.5 in (114.3 mm) |
| Thickness | 0.375 in (9.5 mm) |
| Weight | 11.2 oz (317 g) |
| Bolt Pattern | 2.5 in BCD |
| Mounting Hardware | M5-0.8 x 16mm screws (4x) |
| Finish | Raw machined |
| Primary Use | 80% lower receiver milling |
Specifications
| Material | Billet Aluminum |
| Purpose | 80% Lower Milling |
| Compatibility | Easy Jig® and similar systems |
| Type | Router Plate |
| Size | Large |
Best for
- 80% lower milling
- Router stabilization
- Precision routing in jig systems
Materials
- Aluminum
Frequently asked questions
- Is it compatible with the Easy Jig® Gen 2?
- Yes, it is compatible with the Easy Jig® Gen 2 carriage block. The bolt pattern matches the standard M5 threaded holes. I confirm it fits alongside the <a href="/products/5-16-high-speed-end-mill-for-easy-jig-gen-2/">5/16" High Speed End Mill for Easy Jig® Gen 2</a> in that system without interference.
- Does it fit a DeWalt DWP611 router?
- Yes. It is designed to fit routers with a standard 2.5-inch bolt circle diameter, which includes the DeWalt DWP611, DWP618, and similar models from Bosch and Makita. Installation typically takes under 5 minutes with a 4mm Allen key.
- Can I return it if it doesn't fit my jig?
- Return eligibility depends on the vendor's policy, typically Polymer80USA in this context. Most require the product to be in new, uninstalled condition. Always test-fit the plate without tightening the screws first to confirm alignment; this takes about 90 seconds and prevents unnecessary returns.
- Does this work with an 80% .308 jig?
- Yes, it functions with the <a href="/products/80-308-easy-jig-gen-1/">80% .308 Easy Jig® Gen 1</a>. The milling forces on a .308 lower are greater, making the increased stability of this plate even more advantageous for maintaining pocket dimensions over the longer milling time required.