
Pre Fit Gun Barrels
Before You Start
Your custom pre-fit barrel goes into production as soon as possible, so be sure you're ordering it correctly.

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Select Thread Size

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Make Certain Your Barrel & Receiver Will Work

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Changes After Submitting Are Subject to a Fee
Using a Qualified Individual to Install Pre-Fits
When considering a variable shoulder prefit barrel, (ones that use a torque nut opposed to integral shoulder), make sure a qualified individual who has the proper tools and gauges can perform a functional install for you, as well as hold all liability related to proper headspace
Pre Fit Barrels Offered
Our Mission: To be the top-choice gun barrel making company for precision firearm builders
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Bighorn/Zermatt Arms - Fixed Shoulder - Prefit Barrel
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Curtis Custom - Fixed Shoulder - Prefit Barrels
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Defiance Machine (Tenacity, Ruckus, anTi, and anTi X) Fixed Shoulder - 1.061"x16Px.950"
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Falkor Defense - Fixed Shoulder - Prefit Barrels
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Impact Precision - Fixed Shoulder - Prefit
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Mack Brothers - Fixed Shoulder - Prefit Barrels
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Savage - Variable Shoulder - Prefit Barrel
FAQ - PreFit Gun Barrels
Barrel Nut Accuracy vs Shouldered Barrels
We are frequently asked the question of whether or not installing a barrel nut is as repeatable as a shouldered barrel. The answer is a straightforward yes. We manufacture our barrel nuts in house and have no runout between the internal threads and the torquing surface, which ensures the same barrel/receiver alignment as a shouldered barrel. However, there are a couple of differences we should note:
- Installation of barrel nuts requires more effort/skill. Variable shoulder prefits require proper headspacing gauges, as well as a qualified gunsmith to install correctly. Improper installation can cause harm to the shooter, others around, the firearm itself, and surrounding objects.
- Barrel nut prefits are cosmetically different on certain receivers. Utilizing the thread size to dictate the barrel shank diameter, these types of barrels are smaller in the breech area, typically 1.062” versus 1.200”+. We designed each barrel nut to be as ergonomic as possible to achieve maximum functionality and user-friendly look and feel. Chassis builds allow seamless use, while major stock makers are creating inlets for nuts, some stocks require fitment.
How can I tell which shank my Savage prefit rifle is?
There are two Savage shank sizes: standard and magnum. The standard nuts are .875” (7⁄8”) long and the magnum is .625” (5⁄8”) in length. Due to the fact that models feature both shank sizes, it’s not as easy as saying that a specific model has one and only shank size. Measuring the headspacing nut is the fastest and easiest way to tell the two apart from each other.
Updated info! Measuring the barrel nut is no longer a sure fire method of determining your shank size! You will want to measure the diameter of the barrel shank itself. The small shank ≈ 1.06" dia and the large/magnum shank ≈ 1.12" dia.
How do I install a prefit barrel to my receiver?
We've built a landing page with text instructions as well a video. If you would like the full detailed instruction click below. Or feel free to just watch our tutorial YouTube video.