FX FX Crown Accuracy Issue ?

I don't have a Crown but I'm curious how many shots taken after cleaning to verify accuracy. Sometimes, though not usually, after cleaning my Royale or Boss it can take 20 or 30 shots before their usual accuracy returns.

More information needed: barrel length, liner type (STX-Slug), projectile speed, projectile type & weight, regulator pressure.

With my Impact and Wildcat I took out the liner holding )-rings and replaced them with a carbon fiber liner sleeve ( https://utahairguns.com/product/fx-carbon-fiber-liner-sleeve ). It made a world of difference in both guns and I don't worry so much about shifting POI.

If you over or under torqued the liner nut, that might be a source of the problem. When you turn the nut on by hand, when it contacts the liner, then tighten no more than 1/4 turn.

Hi Bobbybeef,
My experience with several Crowns has been that you need to tighten up the Liner nut (part 11 in the figure below) pretty much as tight as you can get it. I believe the folks above talking about "Liner Nuts" needing to be barely tight are not referring to the Superlight Barrel System on the Crown Mk II, but rather the "liner lock nuts" found on most other FX barrel systems. It would be a sound idea to loosen up the nut and pull the liner to see if the o-rings have dried out and gotten hard. For a .22 they are part # 19952 5.23 x 2.62 NBR70 o-rings.

EPG over on the 30-40yd Challenge Target thread has three Crowns in a variety of calibers and barrel lengths and is getting all of them to shoot really well. His "magic" seems to be the effort he puts into polishing the brass barrel inlet piece to insure that the pellets load smoothly into the liners and don't pick up nicks or cuts from machining burrs. I sent him a barrel I had no luck shooting with and after performing his magic it is "lights out" shooting with a variety of pellets.
Cheers,
Greg

View attachment F10265-tube-kit-superlight-cpl-ENG.pdf

My question is did it not have flyers before? If it didn't, is it a new tin? What else could've changed? How did you clean the liner?

Well, from a guy with a Crown Mk2 and, at one time, 10 or so barrels, I can tell you that some barrels just don't get it. Out of more than 10 barrels I've owned, it's only happened once. I had trouble with a barrel that would shoot "decent" then the next thing you know, it was pretty sad. Changing the spacer spacing, cleaning, etc and it still only shot reasonably well, but not good compared to all the other barrels I've had. If it were me, I'd get a different liner and try that. I might add that I had two of the exact same barrels and one was great and one was not so good. Just to give you an idea, one would shoot dime size, and often single hole groups at 33 yards, the other on it's best day ever, with it's favorite ammo would almost shoot quarter size groups at that distance. It also exhibited random fliers, which at the time I blamed on the ammo, but who knows, I don't see that behavior with any of the other barrels.

If its not shooting dimes or less off a bag/bipod at 30 yards something is wrong. Be it tune, projectiles or liner damage from a metallic rod imo. Id also keep track of when the flyer happens in the mag count and see if it's repeatable

Bobbybeef said:

i have polished a few FX barrels and it makes a difference also indexing the barrel makes a world of difference also

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Indexing is what I always tell people to do. If people dont index their liner the pellet or slug is going to drift to left or right, even without wind

make sure the liner is not backward

Bobbybeef said:

Thats the only problem he said it used to shoot lights out the all of a sudden it stopped I am just trying to figure out why there was a lot of crap in the barrel i put a wire brush down it and caught the flakes of stuff coming out it wasn't pretty but I cleaned it with ballistol and it's a lot better but it's not shooting like my other crown but i have polished that barrel and epoxied a carbon fiber sleeve and it shoots great but thats my personal gun

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I didn't want to assume, but i feared an uncoated multi piece metallic rod and a stainless brush. If that were the case I'd retire the liner. I don't clean any of my fx barrels conventionally. When they start to get wild I shoot a bunch of felt cleaning pellets with clp on them and they group again. (just my way, I'm not suggesting it's a superior method.)

Bobbybeef said:

i have polished a few FX barrels and it makes a difference also indexing the barrel makes a world of difference also

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Absolutely clean every new liner too, they have honing grit in every one I've bought or seen.

I clean every 100-125 shots. Chokes always get fouled with lead. Never, ever use a wire brush. Use only patches moistened with Ballistol until they come clean, then dry ones. 5 -10 shots should season it.

bchannell said:

Well, from a guy with a Crown Mk2 and, at one time, 10 or so barrels, I can tell you that some barrels just don't get it. Out of more than 10 barrels I've owned, it's only happened once. I had trouble with a barrel that would shoot "decent" then the next thing you know, it was pretty sad. Changing the spacer spacing, cleaning, etc and it still only shot reasonably well, but not good compared to all the other barrels I've had. If it were me, I'd get a different liner and try that. I might add that I had two of the exact same barrels and one was great and one was not so good. Just to give you an idea, one would shoot dime size, and often single hole groups at 33 yards, the other on it's best day ever, with it's favorite ammo would almost shoot quarter size groups at that distance. It also exhibited random fliers, which at the time I blamed on the ammo, but who knows, I don't see that behavior with any of the other barrels.

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You have $1100 worth of barrels. I would send them back to FX and demand credit under warranty.

jps2486 said:

I clean every 100-125 shots. Chokes always get fouled with lead. Never, ever use a wire brush. Use only patches moistened with Ballistol until they come clean, then dry ones. 5 -10 shots should season it.

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Just curious why you disapprove with the use of a wire brush.,.are you meaning mild/stainless wire in a brush? If so you are spot on. But brass? Brass will not hurt a steel barrel

Bigragu said:

Just curious why you disapprove with the use of a wire brush.,.are you meaning mild/stainless wire in a brush? If so you are spot on. But brass? Brass will not hurt a steel barrel

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Gun barrels are made from relatively soft steel. You ask any BR shooter, whether airgun, rimfire, or centerfire, and I doubt you'll find anyone who uses brass brushes. If you must, use a nylon bristle brush. I don't use brushes at all, Just patches wet with Ballistol. That gets all the residue out. If it doesn't , then the barrel should be polished with JB bore paste. I don't understand why FX gets by with so many bad barrels. I sent two liners back and they agreed to replace them. It was done rather quietly on their part.