FX Barrel liners with and without external o-rings

Jump to latest Follow Reply
D

Drumsnguns

Member
Jun 14, 2016
959
19
North Carolina, United States
I’m curious how a liner is expected to shoot without the external o-rings. 


I ask because on AEAC, in the Impact Review, it was noted that there wasn’t a whole lot of difference with or without the o-rings. 
I have observed with my .25 slug liner and without the o-rings, I’m seeing diagonal groups of 5” at 10 yards. This just doesn’t seem right

With the 3 o-rings installed, it’s night and day but I have been unable to get single hole groups at 20 yards as I try to harmonically tune. I’ve tried different reg settings and valve settings.

I’m concerned the 5” no o-ring groups might indicate a defective liner.

Has anyone else tried shooting without the o-rings? I’d like to know what group size others might be seeing without these rings

Thanks,

KP

FYI I have a Gen. 1 .25 Impact with 600 mm barrel/pellet liner A and after tuning, I’m seeing consistent 0.23-0.29” groups at 60 m with JSB MKII so I’m pretty confident in my tuning abilities.



 
  • Like
Reactions: monstr2
Good morning Drumsnguns, 

If you have any questions about the mechanics and inner workings feel free to call in (depending on where you live) but there's some tech's always standing by to answer any questions you may have. 

Have a great day, 

FX Customer Service support

Here is the link to different regional numbers to contact. 

https://fxairguns.com/retailers/
 
Upvote 0
Hi KP, 

with all my testing with liner OD orings/delrin sleeve they do improve accuracy and POI shifting. There are so many ways to harmonically stabilized the liner without them the liner become a music wire that vibrates in the center of the liners. the vibration of the hammer spring and hammer striking the valve pin and vibration of the ammo with high pressure air passing through the liner, amplifier high or low with the tension of the liner 1/2 jam nut. 


Here is a video in one mod thats works well you can do at home without requiring a lathe to make delrin sleeve, you can have multiple oring groups 3”-4” apart with teflon tape.

When I have accuracies issues I look 1st at the mag, pellet probe and brass TP, if mods done to them, i seen a lot guys open both TP to wide/long that affect the smooth flow of the ammo—-> now they created large pot holes for the ammo head to dip on. Also you can rotate the liner 12-03-06-09 to find that down and up rainbow of the liner to minimize side to side POI.

above are a few tuning tips, if you want more tips —-> PM me!



Ernest 




https://youtu.be/2FHyJb8p2zk





Ernest
 
  • Like
Reactions: monstr2
Upvote 0
Hi KP, 

with all my testing with liner OD orings/delrin sleeve they do improve accuracy and POI shifting. There are so many ways to harmonically stabilized the liner without them the liner become a music wire that vibrates in the center of the liners. the vibration of the hammer spring and hammer striking the valve pin and vibration of the ammo with high pressure air passing through the liner, amplifier high or low with the tension of the liner 1/2 jam nut. 


Here is a video in one mod thats works well you can do at home without requiring a lathe to make delrin sleeve, you can have multiple oring groups 3”-4” apart with teflon tape.

When I have accuracies issues I look 1st at the mag, pellet probe and brass TP, if mods done to them, i seen a lot guys open both TP to wide/long that affect the smooth flow of the ammo—-> now they created large pot holes for the ammo head to dip on. Also you can rotate the liner 12-03-06-09 to find that down and up rainbow of the liner to minimize side to side POI.

above are a few tuning tips, if you want more tips —-> PM me!



Ernest 






https://youtu.be/2FHyJb8p2zk







Ernest
Click to expand...

So ernest. Does putting all the o rings together in the center of the liner be better than having them separated like how it came from the factory?
 
Upvote 0
I appreciate the tip Ernest. Thanks so much. 
Right now I have two things against me. 

1. winds have picked up since Sunday in central NC. They are gradually slowing but too for meaningful tuning. 


2. Limited air. When my SCBA tank runs out, that’s it until paintball stores open up again. I don’t have a compressor. So I’ve got to go easy. Make every tuning shot count. 


weather forecast says best conditions are this coming Sat. And I’ll try the o-ring tip then. 


I meant to add... this is a brand new MK2, totally stock, only mid is the 57 mm HS is added. No additional porting. 

kp
 
Upvote 0
I appreciate the tip Ernest. Thanks so much. 
Right now I have two things against me. 

1. winds have picked up since Sunday in central NC. They are gradually slowing but too for meaningful tuning. 


2. Limited air. When my SCBA tank runs out, that’s it until paintball stores open up again. I don’t have a compressor. So I’ve got to go easy. Make every tuning shot count. 


weather forecast says best conditions are this coming Sat. And I’ll try the o-ring tip then. 


I meant to add... this is a brand new MK2, totally stock, only mid is the 57 mm HS is added. No additional porting. 

kp
Click to expand...

its usually no wind in the morning 7am -8am in Wilmington thats the time I Shoot 100y-250y distance accuracy testing


If you have the new 16mm HTSA you don’t need the 57mm HS. With 16mm HSTA adjuster you can get max speed as with 57mm HS but with a larger ES between Max and min on the power where.

if you have the 18mm HSTA. Just cut of 2mm on the left side that is unthreatened.
1585592635_7822441265e82393bf007e3.71441216.jpeg





 
Upvote 0
I’ll check to see what I have when I get home from work. I’m essential (hospital) so not a lot of shooting time. 


I got the 57mm HS because I was running out of HSTA at around 130 bar for a max speed of 

900-910 FPS w JSB MKII. 


Now, with 57 mm I get around 960 FPS and still have more HSTA. 
At 150 bar on reg. Valve wide open and 38.5 gn Nielsen Slug I was getting 930-940 FPS with the 57 mm HS. 
Got the speed, need more accuracy. 

i emailed FX to order a few more liner external o-rings to try your tip. 
k

im close to the mountains and there’s at least 5-10 mph winds at daybreak for the week. And I’m driving to work by then. Forecast says 2 mph at 8 am on Saturday. And I’ll be up and ready then. 
 
Upvote 0
on the topic of liner O rings

my .22 barrel have 2 O rings in the barrel lock. the .25 and .30 have no O rings or O ring grove in the barrel lock. The diagram from the support page shows there should be O rings there like the .22. Has this been changed? Should I order replacement barrel locks both .22 cal barrels have them and none of the .25 or 30.?
 
Upvote 0
on the topic of liner O rings

my .22 barrel have 2 O rings in the barrel lock. the .25 and .30 have no O rings or O ring grove in the barrel lock. The diagram from the support page shows there should be O rings there like the .22. Has this been changed? Should I order replacement barrel locks both .22 cal barrels have them and none of the .25 or 30.?
Click to expand...

Only The .177 and .22 have oring on the 1/2 20 jam nut. The .25 and 30 doesn’t have enough wall thickness to support an oring groove.
 
Upvote 0
I’m starting to wonder what heat shrink tubing might do?

mtnGhost. Please describe the picture. Hat materials are you using there. Hard to see.
Click to expand...

I'm using a POM-H "tube" that I made with o-ring grooves cut into it. I bored the I.D. to be very (VERY) snug on the with some custom bits I made for my lathe. I fit in the center of my barrel and it removes a lot of harmonic issues and keeps my groups tight. This has been the best solution for me with FX barrel systems, and I have tried many.
 
Upvote 0
https://www.airgunnation.com/topic/fx-liner-with-carbon-fibre-wrap/

If you want even more stiffness you can double up on the .22 liner and add a second sleeve. The second sleeve 10mm inside diameter 12mm diameter is a slide in snug fit inside the fx steel barrel sleeve. It would have to be stiffer than a 14mm solid steel barrel. Incredibly stiff!
 
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu