FAXON FX7 PREFIT MEDIUM SPORTER PROFILE 16" 1:3T 8.6 BLK BOLT ACTION BARREL

Rifle Barrels › Bolt Action Barrels › FX7 Prefit Barrels › 16″ Medium Sporter 8.6 BLK  |  Works with: FX7 action • FX7 action wrench • .36 suppressors • M18x1.5 hub adapter • 8.6 BLK gauges

How the FX7 Prefit Works

A prefit barrel has its shoulder and chamber machined so that it headspaces correctly when it is torqued against a specific action. Faxon cuts this barrel’s shouldered 1.0625-16 tenon and chamber to headspace on the Faxon FX7 short action, so you do not need a lathe or a gunsmith to cut a chamber. Clamp the barrel in a barrel vise, turn the action onto it with the Faxon FX7 action wrench, torque it, and check headspace with GO and NO-GO gauges before you fire it.

FX7 Prefit barrels are made for the Faxon FX7 action only. Other Remington 700®-pattern actions vary in how far the bolt face sits from the receiver face, so a prefit cut for the FX7 will not reliably headspace on them. For a Remington 700® or a clone, choose a RemAge® barrel, which sets headspace with a nut.

8.6 Blackout, 1:3 Twist

8.6 Blackout fires heavy .338 bullets from a short-action case and was designed around suppressed use. The original 1:3 twist spins heavy subsonic bullets fast enough to expand at subsonic speed. Use ammunition loaded for a 1:3 twist.

Learn more in Faxon’s 8.6 Blackout guide. The M18x1.5 muzzle has a tapered shoulder, and the taper adapter in the box lets you run standard M18x1.5 muzzle devices and suppressor adapters. For suppressors, pick a .36 caliber can such as the HARMONIX® ION .36.

The Medium Sporter Profile at 16″

The Medium Sporter is a classic sporter contour with more steel than a light hunting barrel. It balances weight and stiffness for rifles you carry and still want to shoot well from a bench, and it is a natural fit for short suppressed builds.

FX7 Prefit tenon reference drawing.

8.6 Blackout cartridge reference. Ammunition that does not match this print cannot be guaranteed to function in Faxon barrels.

Ammunition note: 8.6 BLK ammunition on the market varies. Use ammunition loaded for a 1:3 twist and built to the cartridge print. Loads made for semi-auto rifles can have hard primers that cause light strikes in bolt actions.

How It’s Made

1. Drill and ream: 416-R stainless bar gun-drilled and reamed
2. Hone: Bore honed to a fine finish before rifling
3. Button rifle: 5R button rifled, 1:3 twist
4. Air gauge: Bore air gauged
5. Stress relieve: Stress relieved after rifling
6. Profile and thread: Medium Sporter profile turned, 1.0625-16 UNEF tenon and M18x1.5 muzzle threads cut, target crown
7. Chamber: 8.6 Blackout chamber cut and headspaced to the FX7
8. Lap: Bore lapped after chambering
9. MPI and nitride: 100% wet magnetic particle inspected, then salt-bath QPQ nitrided inside and out
10. Engrave and inspect: Laser-engraved with the cartridge and twist, then final inspected

Salt-bath QPQ nitride is a diffusion treatment, not a plating. It hardens the bore and exterior and adds corrosion resistance while adding virtually nothing to the dimensions, a few ten-thousandths of an inch, roughly a tenth the width of a human hair. It needs little to no break-in.

How We Inspect It

Faxon barrels are built to a written control plan, and each run is logged on inspection sheets. Here is what this barrel goes through before it ships.

What’s in the Box

What Owners Say

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What Reviewers and Dealer Customers Say

Build It Out

Other 8.6 BLK Bolt Action Barrels

See every barrel in this line on the FX7 Prefit Barrels page, or browse all Faxon bolt action barrels.

FX7 Prefit 16″ Medium Sporter 8.6 BLK FAQs

What actions does this barrel fit?

The Faxon FX7 short action only. The shouldered tenon and chamber are cut to headspace on the FX7. For a Remington 700® or a 700 clone, choose a Faxon RemAge® barrel, which sets headspace with a nut.

Do I need a gunsmith to install it?

No lathe work is needed. Clamp the barrel in a barrel vise, turn the FX7 action on with the Faxon FX7 action wrench, torque it, and verify headspace with GO and NO-GO gauges before firing. If you are not comfortable doing that, have a gunsmith install it.

What comes in the box?

The barrel and thread protector and taper adapter.

Why 416-R stainless and 5R rifling?

416-R machines cleanly and holds a consistent bore. 5R rifling uses five lands with sloped sides instead of sharp corners, which deforms the bullet less and fouls less. Faxon hones the bore before rifling and laps it after chambering for a smooth, consistent finish.

Does a nitrided barrel need break-in?

Little to no break-in. Salt-bath QPQ nitride hardens the bore and resists corrosion and fouling while adding virtually nothing to its dimensions.

Can I run a suppressor?

Yes. The muzzle is threaded M18x1.5 with a tapered shoulder; use the included taper adapter with standard M18x1.5 devices and adapters, and a .36 caliber or larger suppressor.

What ammunition should I use?

Ammunition loaded for a 1:3 twist and built to the 8.6 BLK cartridge print. 8.6 BLK ammunition on the market varies, and loads with hard semi-auto primers can cause light strikes in a bolt action.

Where is it made?

In Greater Cincinnati, Ohio, and it is covered by the Faxon Lifetime Guarantee.

Remington® and Remington 700® are trademarks of Remington Arms; Savage® is a trademark of Savage Arms; RemAge® is a trademark of its owner. Faxon is not affiliated with Remington or Savage. HARMONIX® and MuzzLok® are trademarks of Faxon Firearms. Always verify headspace before firing, and know and follow all federal, state, and local laws.