Proof Research PXT carbon fiber prefit barrel for Terminus
At a glance
Full specificationsProof Research
Proof Research - PXT Carbon Fiber Prefit Barrel - Terminus
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Overview
A PXT carbon fiber prefit barrel for your Terminus action
This Proof Research prefit is a carbon fiber wrapped Sendero barrel with PXT (PROOF Exponential Twist) rifling, made for Terminus Apollo, Kratos and Zeus Quick Change actions. It arrives chambered and threaded, with a 5/8-24 threaded muzzle, ready to torque onto your action and headspace check with gauges. Available in 10 chamberings from 22 Creedmoor to 300 PRC. Choose your caliber, then your Terminus action, then the finish length.
Ready to install
Proof's prefits are chambered and threaded for a simple install with few specialized tools: torque the barrel on with the proper action wrench and torque setting, double check headspace with proper gauges, and head to the range.
PXT rifling
PXT starts the bullet on a very gradual twist and accelerates it through the bore. Proof says this cuts the initial rifling lead angle by about 95 to 98% and lowers bullet engraving force by about 30%, for less pressure spike, less throat erosion and less felt torque.
30 to 100% longer barrel life
In Proof's controlled testing, PXT barrels showed a 30 to 100% increase in barrel life before measurable accuracy loss. Proof also reports 20 to 50% smaller groups across multiple ammunition types and lots.
Up to 64% lighter than steel
Aerospace-grade carbon fiber impregnated with a proprietary matrix resin, rated by Proof at up to 64% lighter than a steel barrel of similar contour, with improved heat dissipation. These run 2 lb 07 oz to 2 lb 13 oz by Proof's published figures.
Made for Terminus
Each barrel is made specifically for the Apollo, Kratos or Zeus Quick Change action: pick the Terminus action you own.
Specifications
Construction
Chamberings, twist and lengths
Action models
Weight by variant (Proof's figures)
Fitment
Will it work with your rifle?
Works with
- Terminus Apollo, Kratos and Zeus Quick Change actions
- Suppressors and muzzle devices threaded 5/8-24
Will not work with
- Other makers' actions, or a different action length than the barrel is made for
- Bolt faces that do not match the chambering you choose
Proof's fitment notes:
- Each barrel is made specifically for the Apollo, Kratos or Zeus Quick Change action: pick the Terminus action you own.
Rifle barrels ship for a flat $14.95 per order, regardless of quantity, and do not qualify for free shipping due to their size and handling requirements.
Detail
Installing it and the fine print
What do I need to install it?
An action wrench for your Terminus action, a barrel vise, a torque wrench set to the action maker's spec, and go/no-go headspace gauges for your chambering. Always confirm headspace before firing.
Does the twist change by caliber?
Yes. Each chambering comes in one PXT twist, shown next to the caliber. PXT starts slower at the breech and accelerates through the bore; the listed twist is Proof's designation for the barrel.
Will the engraving line up with my stock?
Not guaranteed. Proof notes that, due to variance in actions, it does not guarantee the timing and alignment of the barrel engraving to your stock line.
- Fits
- Terminus
- Barrel
- Carbon fiber, PXT
- Contour
- Sendero
- Chamberings
- 10
- Lengths
- 16.5" to 22"
- Muzzle
- 5/8-24
Works with
- Terminus actions (Zeus Quick Change, Apollo, Kratos)
- 5/8-24 muzzle devices
Will not work with
- Other makers' actions
- Mismatched action lengths
Product images
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Shipping
Free same day shipping
Most orders over $199 ship free. We ship same day on all in-stock orders received before 14:00 Mountain Time. Free Shipping orders use standard ground and typically deliver in 1 to 4 days. Excludes international orders, Alaska and Hawaii, and select oversized items. All orders valued over $1,000.00 ship signature required.
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If you need an item fast, cost-effective expedited options are available at checkout. Most expedited orders ship via FedEx or Overnight Mail.
Local customers
We are in 2317 Grand Park Dr Unit 2B Grand Junction, CO 81505 and we stock every item we sell. We love seeing customers and encourage you to stop by — just leave a comment in the order notes during checkout.
International shipping
We ship to international shoppers in 82 countries registered with EasyExport®. Registration is free and EasyExport does not share your information, and you can register before or after you shop. See International Export for details.
Returns
Not quite perfect? Red Hawk will make it right, no matter what. Guaranteed. Most items have a 30-day window from the day the product was delivered to you. Excluded are ammo and ORM-D products, custom ordered items, items not in original condition, and international orders. Every item we sell also carries a manufacturer warranty, and we only work with manufacturers who stand behind their products.
Common questions
How do I know the items I'm buying are compatible?
Check the Fitment section above — it lists what this part works with and what it does not. If you are still unsure, call 1-970-242-6166 or use the chat icon at the bottom right of the page — our team builds precision rifles with these parts every day.
Where are you located?
2317 Grand Park Dr Unit 2B Grand Junction, CO 81505. We ship every single order from our own warehouse and take pride in being part of our local hunting and competition shooting community.
I can't find the configuration I need — can you special order it?
Absolutely. Call 1-970-242-6166.
What if there is an issue with the product I ordered?
We will make it right, no matter what. We only carry products from top-tier manufacturers who stand behind them.
Which items need to ship to an FFL?
Receivers and actions, barreled actions, complete rifles and suppressors ship to a licensed FFL dealer. Barrels, stocks, triggers and accessories ship straight to your door.