FX STX Superior, Image 1
FX STX Superior, Image 1

FX STX Superior Heavy Liner, 700mm, .22 caliber

rating
3.03 reviews
1 answered question

$109.99

Caliber:.22 (5.5mm)

.22 (5.5mm)
.25 (6.35mm)

Length:700mm

700mm

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Description

This FX Superior Smooth Twist X Heavy Barrel Liner (Superior STX Heavy Barrel Liner) will shoot both heavier pellets and heavier slugs with improved performance vs. regular Superior STX barrel liners because of a customized twist rate.

The Superior STX Heavy was created using the same innovative exterior-pressed rifling, but with tighter tolerances and upgraded techniques and for greater precision.

This 700mm version gives you a little more speed than the shorter versions, making it ideal for long-range shooting. If you're looking for an easy way to upgrade your FX air rifle, get a Superior STX barrel liner and drop it in today.

FX Superior STX Heavy Liner, 700mm, .22 caliber

  • Recommended for use with heavy pellets and slugs
  • Compatible with FX Crown Continuum, Impact, and Wildcat models with 700mm STX barrels
  • 1:16 Twist Rate

Specifications

Weight
0.25 lbs
Caliber
.22 (5.5mm)

Overall Rating

rating
3.03

Ratings

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3 of 3 FX STX Superior Heavy Liner .22 (5.5mm) Cal Reviews

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Overall rating
rating
4
Value for money
rating
3

In my Maverick Sniper 700mm the Heavy liner allows me to shoot at higher velocities than the standard liner. This gives me a slightly flatter trajectory and allows me to shoot heaver slugs giving me greater stopping power on larger game and bringing the gun up to its potential.

The Heavy liner seems to work best with slug weights 26gr and above. And with velocities 930-1020fps. With higher reg. pressures. The Standard liner seems to cap out at 26gr and below. And velocities below 950 fps. (860-920 fps preferred). And with lower reg. pressures. Both liners have ammo, slug mfgs., weights they prefer and many they don’t prefer. I find each seem to prefer 3/10 slug combinations I try regardless of the tune. With the standard being easier to tune (probably due to lower reg. pressure), but when the heavy is tuned, it is a tack driver. My standard liner is preferring 0.217 slugs and my Heavy preferring 0.218 slugs, yours may vary.

If you are not planning on pushing beyond 26gr, 930fps, 100-150 yards at 1-1.5MOA limit ever you may not want to consider this liner. The standard liner will serve you very well. I shot 26gr Jav. Gen1’s at 900 fps for a year sub-MOA at 150 yards with the standard liner. It was the only load that shot that well, but I also had several good loads at MOA and 1.5 MOA at 100 yards too with 21 & 23grs. All never exceeding 930fps. Fine for hunting. But If I need to push out beyond 150 yards the 26grs open up around 165 yards and become unstable and the 21&23 around the 120yard mark. With the Heavy liner I am able to use 28-31.2gr and reach out 150 to beyond 200 yards while keeping within the 1-1.5MOA range, slug depended. And I haven’t tested farther yet. Keep the velocities around 950-1000fps. The Heavy likes it faster than the standard. Slug your barrel for a diameter check, then buy packages of many different brands and weights of slugs to test.

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Overall rating
rating
4
Value for money
rating
2

I got this liner to shoot heavier slugs over 23gn. But my standard superior shoots just as good. And actually shoots a broader range of slugs and pellets than the heavy. But Ive not tried anything over 28 gn in the heavy,so maybe it will shoot those.

If you have a standard superior liner and all your gonna shoot is pellets and slugs under 23 gn. Don't waste your money on the heavy liner.

Ryan Feb 03, 2023

I shoot Neilsen 31.2 grain out of my heavy liner at 997 PFS to 1000 FPS, and it is a tact driver. I am getting it ready for competing in Precision Marksman at RMAC, and still fine tuning it. IF your shooting lighter slugs you're defeating the purpose of the heavy liner and what it was designed to do. For example, if I want to shoot FX Hybrids they are designed to be shot out of the Standard Superior Liner and shoot great out of it.

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Overall rating
rating
1
Value for money
rating
1

I like fox products but disappointed in Pyramid Air.

Buy from a different place.

The barrel I received had pencil marks on it. It was apparently a return.

Jeremy Feb 14, 2023

The Pencil Marks are the indexing marks. The indexing marks should be facing in the up position when inserting a new barrel. Otherwise at distance you will be off to the right or left and won't be able to figure out why. Pencil Marks are your friend.

Daniel Feb 08, 2023

Your rating is supposed to be for the 700mm barrel liner. Everything else is irrelevant and should be removed. I doubt that pencil marks on the liner in any way affected the liner.

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