FX Streamline .177 at my wits end

Plastic or wood stock? Try it without the Huggett

Did you look closely at the transfer port when the barrel was off? To shoot a few good shots with a clean barrel, then see it significantly deteriorate, could be symptomatic of something collecting lead and fouling. A small burr on the TP could both deform the pellet, and collect lead. Just a thought, something is badly wrong, not just a bad reg or poor tune.

Maybe check to see if the breech seal is still in place?



https://fxairguns.com/wp-content/uploads/2021/05/streamline.pdf

a quick search revealed the following...

https://www.airgunnation.com/topic/accuracy-problem-with-177-fx-crown/

A Google searched revealed a few others, including a reply I did on another forum with my experience. 

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This refers to the liner system, not the solid ST barrel on the Royale.

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Good point...and one that I missed. Thanks for the clarification!

a quick search revealed the following...

https://www.airgunnation.com/topic/accuracy-problem-with-177-fx-crown/

A Google searched revealed a few others, including a reply I did on another forum with my experience. 

Click to expand...

This refers to the liner system, not the solid ST barrel on the Royale.

Click to expand...

Good point...and one that I missed. Thanks for the clarification!

Click to expand...

Rob, the only reason I mention it, I've had one rifle of each design, hardly a statistically valid sample. But if my experience is at all indicative, there is a big difference between the two designs. My Royale 400 is always on zero, very accurate, and not at all subject to POI variances. 

Those groups does not look to bad. You probably has to experience a litle with the velocity, by adjusting the hammer spring, to see if there is imrovements. I have a FX bobcat which has the same barrel, and shoots the jsb heavy fine. So might be worth trying those also.

Yes it can be adjusted. But you really need a chronograph to do it. I will not explain the prosedure, but there is probably videos on youtube showing how to do it. But before you do, trying the 10 grain JSB heavy also, should get the velocity somewhere inbetween thouse two previous pellets you have tried. If you are lucky the gun might be tuned for the 10 grain from factory. So I would recommend trying thouse also, before changing anything on the gun.

Yeah it’s terrible, should just sell it. 

This is why fx doesn’t sell very many .177 barrels. So many others have had the same problems you have had. Best bet would be a caliber change. 

Yeah it’s terrible, should just sell it.

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I’m thinking thats the best plan. Maybe just run it thru my band saw a few times and stuff it in the trash.

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Dude! I was kidding! 


First, you still don’t have a chrono which is needed to understand what’s going on a bit better. Second, you haven’t taken the gun apart to diagnose small details but this one depends on your willingness to work on it. At the end of the day even shooting as it is it worth a few hundred bucks to someone. 


pretty hard to help you with the issue because we don’t ah e the ability to take a look at details and just throwing ideas out at best. Best thing if you can/willing is to take it apart and check everything. Could be as simple as a small oring, it’s not brand new after all. Cool project gun if you do decide to sell it. 


Edit: forgot to mention the 35 yard groups aren’t bad at all, not quite bench rest good but honest it’s not bad.