Description
I was chasing a bull elk in the Colorado backcountry, my old rifle feeling like an anchor after miles of hiking. That’s when I started looking for a serious, no-nonsense long-range platform that could handle magnum cartridges without flinching. The answer I found, and the one I’ve trusted ever since, is the Remington 700 Long Action Magnum Calibers X Mark Trigger. It’s the factory-original barreled action and trigger assembly for the legendary Model 700, chambered for powerful long-action magnum cartridges like .300 Win Mag and 7mm Rem Mag, and it’s designed to be the perfect foundation for a custom precision rifle build. At $432.67, it’s a smart way to start a project with a proven, time-tested core.
Here’s the thing—starting with a factory Remington 700 action is one of the most reliable paths to a custom rifle. The Long Action Magnum version gives you that famous, rock-solid cylindrical receiver that’s been the backbone of countless competition winners and military sniper systems. The included X Mark Pro trigger is a huge step up from older designs; it’s externally adjustable from 2.5 to 5 pounds, breaks cleanly, and is far more consistent and safe than the old Walker-style triggers. I’ve put hundreds of rounds of .300 Win Mag through a build based on this action, and the lock-up is still as tight as day one. The true beauty is that this setup is drop-in ready for a vast ecosystem of aftermarket parts. You can pair it with a chassis from MDT or a stock from Bell and Carlson, screw on a premium barrel from a maker like Proof Research or Christensen Arms, and have a world-class rifle without the cost of a fully custom action. The action itself, a critical component, has a weight of around 2.5 pounds for the receiver alone, providing a solid base for your build.
Let’s talk about the X Mark Trigger specifically, because it often gets overlooked. When Remington introduced it, it was to address legacy issues and provide a safer, more reliable unit. It uses a sealed housing to keep out debris—a real benefit when you’re prone in the dirt or snow—and the adjustment screw is easy to access with a provided tool. Is it a $300 aftermarket trigger? No. But for a factory unit, it’s impressively crisp and completely usable for hunting or long-range practice right out of the gate. This entire package is available at firearms-missouri.com for Missouri residents and nationwide, making it a straightforward foundation for your next serious rifle project.
| Specification | Detail |
|---|---|
| Action Type | Bolt Action, Long Action Magnum |
| Caliber Compatibility | .300 Win Mag, 7mm Rem Mag, .338 Win Mag, etc. |
| Trigger | Factory X Mark Pro Adjustable (2.5-5 lbs) |
| Receiver Material | Solid Steel |
| Bolt Design | Dual Opposing Lug, Cylindrical Receiver |
| Barrel Thread | Factory Barrel (varies), Standard Remington Thread Pattern |
Pros & Cons
The pros are significant. You’re getting the most cloned and supported action pattern in the world. Aftermarket support is staggering—every stock maker, chassis system, and trigger manufacturer makes parts for the Remington 700 footprint. The magnum long action gives you access to high-performance hunting and long-range cartridges. The price point is also a major advantage for a project build. The cons? It’s a project. You need to source a stock, optics, and possibly a barrel. It’s also a factory action, so while incredibly solid, it may not have the refined finish or ultra-tight tolerances of a $1,200 custom action. That said, for most shooters, the performance difference is negligible.
Who is this for?
This is for the shooter who wants to build, not just buy. It’s for the hunter who needs a .300 Win Mag for western elk but wants to choose his own stock and optic setup. It’s for the precision rifle enthusiast on a budget who understands that the action is the heart of the rifle and wants to invest in a quality foundation they can upgrade over time. If you enjoy the process of selecting components and creating a rifle that’s uniquely yours, this is your starting block.
Frequently Asked Questions
Q: What calibers does this “Long Action Magnum” action accept?
A: It’s designed for standard .532″ bolt face magnum cartridges like .300 Winchester Magnum, 7mm Remington Magnum, .338 Winchester Magnum, and similar. It is not for standard long-action calibers like .30-06 or for ultra-magnums like .300 RUM without modification.
Q: Does this come with a barrel?
A: Typically, yes. This is generally sold as a barreled action, meaning it includes the factory barrel. However, one of the most common upgrades for a custom build is to later replace that factory barrel with a premium aftermarket option from a specialist.
Q: Can I adjust the X Mark Trigger myself?
A: Absolutely. Remington includes a small hex key tool to access the adjustment screw located in front of the trigger. You can safely adjust the pull weight within its specified range. It’s a simple process, but always practice safe firearm handling and function test after any adjustment.
If you’re ready to build a magnum-caliber rifle on the most proven platform available, this Remington 700 foundation is where your project begins.
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