Variable gas port for Cz/Vz 858/58?

MiltonBradly

MiltonBradly

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Just thinking out loud... Has anyone ever played with restricting or varying the gas feed to the piston on one of these rifles... I was shooting on the weekend (first time in a while) and forgot how much the gun jumps about while trying to hold on target during rapid fire. I'm wondering if battle conditions dictated far more gas to the piston than a "never gets dirty" range gun would need...

I have read a few how-to's for drilling bleeder ports in the gas tube of SKS's in order to soften the cycle but the extremely short stroke of the 58/858 piston before the bleed ports are uncovered leaves little room to play (and I don't think I want to drill holes in my gas block yet). I'm wondering about a set screw drilled into the gas block that intersects the gas port. The more it is screwed in the more it restricts the port...

Thoughts?

MB
 
I know i was firing some reduced loads with 180 grain cast lead bullets(round nose no less) and it cycled fine... I was kind of surprised they fed as well as they did(100% in 10rds). The brass landed quite a bit closer as a result. I wouldn't doubt your could restrict the gas significantly and still have it cycle. You might even get better accuracy as the barrel whips significantly with the gas piston up that high.
 
My CSA shoots the brass ten feet directly up. Kind of interesting at the range that i shhot at as it has a roof. I never noticed with my Cz 858. It would be interesting if we could turn down the pressure.
 
Perhaps I should mess around with modding a cheap SKS gas block (very similar to a cz) and see how it works?... I'm thinking a set screw with a tapered pointy end to act as an adjustable obstruction to the port or set screws drilled with varying sized bleed ports so they bleed off some gas before it gets to the piston. Start small and open it up until the gun fails to cycle then make a new one a few drill sizes smaller... If the bleed port starts to get plugged up you get more reliable cycling :D
 
MiltonBradly said:
Perhaps I should mess around with modding a cheap SKS gas block (very similar to a cz) and see how it works?... I'm thinking a set screw with a tapered pointy end to act as an adjustable obstruction to the port or set screws drilled with varying sized bleed ports so they bleed off some gas before it gets to the piston. Start small and open it up until the gun fails to cycle then make a new one a few drill sizes smaller... If the bleed port starts to get plugged up you get more reliable cycling :D
Click to expand...

That was my first thought regarding this, the same as a Mccann M1 gas plug. Welding a small fitting to the front of the gas block then drilling and tapping as needed. The Mccann uses 8-32 allen head cap screws and you could use a number bit set to tune it. I dont know if the SKS gas block could be made to work very well though as the design is quite different and I believe the piston head on the VZ 58 is bigger than the SKS'. Attaching the upper hg would require finnicky fab work as well. The VZ gas block is stainless so that should be considered as well. Heres another idea I just thought of: drill and tap the head of the piston and drilled a cross-hole behind the head and mount the cap screw in the piston. You can get new ones from cncwarrior.com. The reduced pressure may outweigh the decrease in strength.
 
Just put a muzzle brake on it. I have an older Infratek brake (made by Dlask, A6 model I think) and there is no muzzle movement during rapid fire drills.
 
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