Description
The Primary Arms PLx Top Cap Reflex Mount solves a problem that anyone running an LPVO knows well: when a target pops up close and personal, you don't have time to dial down magnification. This top cap bolts directly to your PLx scope mount and sets a mini reflex sight at the 12 o'clock position, right on top of your optic. A quick lift of the head and your dot is there, ready for fast, both-eyes-open shooting inside 25 yards.
What Sets the PLx Top Cap Apart
Unlike side-offset red dot setups, the piggyback style keeps your dot centered and usable no matter which shoulder you're running the rifle from. That makes it a natural fit for anyone who trains ambidextrous or shifts positions around cover. When mounted on the 30mm PLx 1.5 inch mounts, it places your red dot at a 2.04 inch height, which lines up cleanly for a natural cheek weld and head lift.
Built to Hold Zero
The mount is machined from 7075 aluminum with a black hardcoat anodized finish, so it shrugs off recoil, weather, and hard handling without walking off zero. It ships from Primary Arms in the USA and carries their Lifetime Warranty, which tells you they stand behind the machining. Recommended torque is 16 to 18 inch pounds on the mounting hardware, so grab a torque wrench and snug it down properly for the most consistent results.
Optic Compatibility Worth Knowing
The footprint accepts the Primary Arms Classic Series 24mm Mini Reflex Sight along with any Holosun 507c or RMR footprint optic, giving you plenty of options for what sits up top. Keep in mind this is designed specifically for 30mm PLx scope mounts and won't mate up to other brand mounts, so it's built to pair with your existing PLx setup rather than serve as a universal solution.
Key Specifications
- Manufacturer: Primary Arms
- MPN: 910109
- UPC: 818500018384
- Model: PLx
- Tube Diameter: 30mm
- Mount Type: Top Cap / Piggyback Reflex Mount
- Red Dot Height: 2.04 in (on 1.5 in PLx mounts)
- Optic Footprint: Holosun 507C / RMR / PA Classic 24mm Mini Reflex
- Material: 7075 Aluminum
- Finish: Black Hardcoat Anodized
- Torque Spec: 16-18 in. lbs.
- Weight: 0.125 lbs
- Country of Origin: United States
- Warranty: Primary Arms Lifetime Warranty
What’s Included
- Primary Arms PLx Top Cap Reflex Mount, 30mm
- Mounting hardware
Frequently Asked Questions
What optics fit the PLx Top Cap Reflex Mount?
The mount uses a footprint that accepts the Primary Arms Classic Series 24mm Mini Reflex Sight, along with any Holosun 507c or RMR footprint optic. That gives you a good range of popular mini red dots to choose from. Just confirm your dot matches one of those footprints before ordering.
Will this top cap work with scope mounts from other brands?
No. This is designed specifically for the 30mm PLx scope mounts and won't mate up to other brand mounts, including 30mm Reptila mounts. It's meant to pair with your existing Primary Arms PLx setup rather than serve as a universal fit.
How high does the PLx Top Cap Reflex Mount position the red dot?
When used on the 30mm PLx 1.5 inch mounts, it places the red dot base at a 2.04 inch height. That lets you simply raise your head off the stock to pick up the dot for close range work. It's a comfortable transition height for most shooting positions.
Why choose a top cap piggyback mount over a 45-degree offset?
The piggyback style keeps your red dot centered above the scope, so it works no matter which shoulder you're running the rifle from. That's a real advantage for anyone shooting around cover or training with both hands. It generally gives you more ways to see your dot than a traditional side offset.





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