FX 700 mm barrel, any benefit venting inside shroud?

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bigHUN

bigHUN

Member
Jan 16, 2020
3,954
1,231
L4G7X4 Canada
I was removing the shroud/barrel in and out several times and keep tuning with my chrono, and this how I noticed I may lost the oring inside the shroud between the liner lock and the compensator ? I heat up the hotmelt and toke all apart.

This is how the Canadian shroud tube looks like (and the lost oring was most likely just a false alarm , btw not shown on the barrel bill of material pdf neither).

1587356526_19918807055e9d236e783895.33770746.jpg




Then I have seen other folks pictures about that compensator have some large slots. Makes me wonder what may be a benefits of venting the stripped air blast inside the shroud and what can I do to this my shroud that may improve things (inside the shroud of course)?

I may be able to order somebody to make me a new piece on lathe, if I chop of the front thread for the muzzle nut, to gain max 20 mm more length (inside the shroud aluminum tube) but that is it...to fit the gun in the original FX hard case. What features can give me and what positive results?
 
Shall be an oring here in this my 25 cal compensator piece?

Some ppl reporting they're 22 cal liner have it and picture above most likely not...

1587435095_16581184025e9e5657a6cea5.67669471.jpg


Because this piece is threading directly to the liner lock screw, and if there is a solid metal to metal connection then a purpose of having 2 orings in the rear of the shroud alu tube loosing the value? My open mind telling me either make the barrel inside shroud float or...not

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I was tuning the FX Impact last weeks in my basement. The FX was mounted on a jig, about a 1.5 meter away was the all metal pellet trap box (20x20x20 cm). I spent over a full tin of pellets during several days chronographing. I had to vacuum a basement every day because the air blast was blowing the shredded lead dust out from the pellet trap.

So the story got to a point, what to do with the air wave/blast exiting the muzzle hole? Redirect or strip it away from the path? Inside or outside of the shroud tube? Pros and cons?
 
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I am 60yo and looks like my experience with strippers will need to improve, but as I read it - if you put them to a right place can work like charm ;)

I just measured 47.48 mm from the pellet liner to muzzle nut (how it is assembled right now on my 700mm FX), inside this length a projectile is already without any contact with sidewalls and surrounded with turbulent air only.

If I can take this concept from Hatsan air stripper, the brass cone distance need to be adjusted precisely from the liner in order to work a "magic". I may be wrong but that would put it inside either the liner stainless nut or compensator eventually (and air strip inside the shroud then)? But then how to went the shroud?

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The other thing I don't like to think about removing the stripper on and off whenever I put the FX in the case.
 
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I can design a new 20 mm longer (max - total length to fit the case) compensator with an adjustable stripper cone inside but I have not seen earlier (or better to say I did not pay attention) how is the shroud vented. Or the tube will stay pressurized ? and will vent out through a muzzle once the projectile is gone?

I saw one another AGN thread recently ppl drilling 4-6 small holes beneath the tube at the rear, but I would like to avoid altering any original piece on FX.

I have been following several threads how to make the most power out of this 25 cal FX Impact MK2 PP, I got that work well now, but ended up with a SIDE EFFECT of huge big air blast wave coming out from the muzzle. So a next project is coming up these days.

How to?
 
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