The Proof Research Latitude LOP 22LR Sendero 18″ Adjustable LOP is a precision rimfire rifle engineered for shooters who demand sub-MOA accuracy from a lightweight, field-ready platform. Built around a carbon fiber-wrapped, cut-rifled barrel and the Zermatt Arms RimX action, this rifle delivers consistent performance in competition, training, and varmint control. The adjustable length-of-pull and cheek riser allow a custom fit for any shooter, while the detachable box magazine and right-hand bolt layout keep operations smooth under pressure. Per Proof Research specs, each rifle ships test-fired with a guaranteed accuracy standard—no guesswork, just results.
| Manufacturer | Proof Research |
|---|---|
| Model | Latitude LOP 22LR Sendero 18″ |
| Material | Carbon fiber-wrapped barrel, aluminum receiver, carbon-fiber stock |
| Compatibility | .22 LR rimfire ammunition, Zermatt Arms RimX action |
| Finish | Matte black (per manufacturer specs) |
| Weight | Approximately 6.2 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Carbon Fiber-Wrapped Cut-Rifled Barrel — WHY IT MATTERS: Reduces weight by 40% over steel while maintaining sub-MOA accuracy and faster heat dissipation for sustained fire during matches.
- Zermatt Arms RimX Action — WHY IT MATTERS: Provides a true 60-degree bolt throw, controlled round feed, and a crisp trigger break that’s compatible with aftermarket triggers like Timney or Geissele.
- Adjustable Length-of-Pull and Cheek Height — WHY IT MATTERS: Dial in a perfect cheek weld and LOP from 12.5″ to 14.5″ without tools, ensuring consistent eye alignment and recoil management across different shooting positions.
- Detachable Box Magazine — WHY IT MATTERS: Reloads in under 2 seconds with a 10-round rotary magazine that feeds standard and high-velocity .22 LR without rim lock or jams.
- Test-Fired Accuracy Guarantee — WHY IT MATTERS: Every rifle ships with a 5-shot group target proving sub-0.5 MOA at 50 yards, eliminating the need for break-in or accuracy verification.
Who It’s For
This rifle is built for law enforcement precision rifle instructors, military marksmen transitioning to rimfire for training, and competitive shooters in NRL22 or PRS Rimfire disciplines. It also suits serious varmint hunters who need a lightweight, accurate rifle for small game at ranges out to 200 yards. If you require a rifle that matches centerfire ergonomics and triggers for cost-effective practice, this is your platform.
Pros/Cons
Pros: Sub-MOA accuracy out of the box; adjustable stock fits multiple shooters; lightweight for carry; Zermatt action is proven in competition; test-fired target included.
Cons: Price point at $4548.77 is high compared to production rimfire rifles; stock adjustment range may not accommodate shooters with very short or very long arms without an aftermarket pad; right-hand only layout limits left-handed shooters.
Comparison
| Feature | Proof Research Latitude LOP | Geissele Super 700 | Timney Triggers Competition |
|---|---|---|---|
| Action Type | Zermatt RimX (custom) | Remington 700 clone | Remington 700 (drop-in) |
| Barrel Material | Carbon fiber-wrapped steel | Stainless steel | N/A (trigger only) |
| Weight | ~6.2 lbs | ~8.5 lbs | ~0.25 lbs |
| Adjustable LOP | Yes (12.5″–14.5″) | No | No |
| Accuracy Guarantee | Sub-0.5 MOA at 50 yds | No guarantee | No guarantee |
| Price | $4548.77 | $1,895.00 | $249.95 |
FAQ
What is the barrel twist rate on the Proof Research Latitude LOP 22LR?
The barrel uses a 1:16″ twist rate, optimized for standard 40-grain .22 LR ammunition. This twist stabilizes most match-grade and high-velocity loads without over-stabilizing lighter bullets.
Does this rifle accept aftermarket triggers?
Yes. The Zermatt Arms RimX action is compatible with most Remington 700-style triggers, including Timney, Geissele, and TriggerTech units. Expect a crisp, adjustable pull weight between 1.5 and 3.5 lbs with a drop-in installation.
What type of magazine does it use?
It uses a detachable 10-round rotary magazine designed specifically for the RimX action. The magazine is made from reinforced polymer with a steel feed lip for durability. Spare magazines are available separately.
Is the rifle available in left-hand configuration?
Currently, the Latitude LOP is offered only in right-hand bolt orientation. Left-handed shooters should consider the standard Proof Research rimfire model or an aftermarket conversion, but that may void the accuracy guarantee.
What is the warranty on this firearm?
Proof Research offers a limited lifetime warranty on the barrel and action against manufacturing defects. The stock and adjustable components are covered for one year. Normal wear and tear from use is not covered.
Why Buy From Us
- ✔ Nationwide delivery (all 50 states)
- ✔ Ships 1-2 business days
- ✔ 30-day returns
- ✔ Secure checkout
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Last updated: April 2026
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