gas cylender Norinco +Gas Piston

lavoltiges

lavoltiges

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How do I know if my gas cylender Norinco is good quality and good measures
same with Gas Piston

is it a requirement to change them? to get better performance or is there Norinco parts that do the job after taking measurements

thank
 
Hey J.
With the cylinder assembled on rifle
Point muzzle up
Hold back oprod
Push piston into cylinder and let go
If it drops slowly with resitance or vacuum ... GOOD ;)
If it drops fast with no resistance or no vacuum, NO GOOD :(

Replace with M1A or USGI parts cylinder, plug AND piston
Brownells
Treelinem14
Tactical Teacher (EE)
 
Last edited:
45ACPKING said:
Hey J.
With the cylinder assembled on rifle
Point muzzle up
Hold back oprod
Push piston into cylinder and let go
If it drops slowly with resitance or vacuum ... GOOD ;)
If it drops fast with no resistance or no vacuum, NO GOOD :(

Replace with M1A or USGI parts cylinder, plug AND piston
Brownells
Treelinem14
Tactical Teacher (EE)
Click to expand...
To add to this discussion...
Please never do this to your gas system:

IMG00472.jpg

IMG00476.jpg
 
45ACPKING said:
Hey J.
With the cylinder assembled on rifle
Point muzzle up
Hold back oprod
Push piston into cylinder and let go
If it drops slowly with resitance or vacuum ... GOOD ;)
If it drops fast with no resistance or no vacuum, NO GOOD :(
Click to expand...

What's the issue if the piston drops fast with little or no vacuum resistance?
That is to say, how does this affect rifle function?

I ask, because my 22" M305 does this, but there appears to be no issues in terms of operation on the firing line with Norc ammo.
 
If the piston falls quickly with little to no vacum then it is possible that your gas pressure to cycle the gun may become an issue. If there is no or little vacuum the gas could blow by the piston instead of forcing the piston to strike the oprod and therefor cycle the bolt. Oddshot, have you had any cycling issues with your M305 yet?
 
walleyed99 said:
If the piston falls quickly with little to no vacum then it is possible that your gas pressure to cycle the gun may become an issue. If there is no or little vacuum the gas could blow by the piston instead of forcing the piston to strike the oprod and therefor cycle the bolt. Oddshot, have you had any cycling issues with your M305 yet?
Click to expand...

No, it cycled well on firing. But I only ran about 30 rounds through it.

Would this condition exist because the inner diameter of the gas cylinder is too big, or the outer diameter of the piston is too small?
 
walleyed99 said:
If the piston falls quickly with little to no vacum then it is possible that your gas pressure to cycle the gun may become an issue. If there is no or little vacuum the gas could blow by the piston instead of forcing the piston to strike the oprod and therefor cycle the bolt. Oddshot, have you had any cycling issues with your M305 yet?
Click to expand...

Exactly ;)
 
also, would you replace this part too?

h ttp://www.brownells.com/rifle-parts/gas-system-parts/gas-pistons/m14-m1a-gas-piston-cylinder-prod27098.aspx
 
My best advice here is.... If it works reliably as is, despite all I've said above regarding the drop test... You don't need to fix it :D

IF a guy was to be replacing the norinco gas system with a U.S. Made or sourced gas system, cylinder, piston and plug are needed.
The gas band plate is same so no need to replace
The chinese spindle valve set can be used in a US cylinder but may require some polishing to fit.
Chinese gas lock is reused as US versions are not threaded the same

We need a dedicated sticky on the subject of chinese VS US M14/M1A parts compatability. Would sure help a lot of guys out.
 
pizdets17 said:
it doesn't remember lol? It does not cycle the nork ammo.. Even with your fancy new green mag lmao.
Click to expand...

Ya, some rifles do seem to get finicky with the chinese ammo
Ideally I like to see a nice slow , 2 to 3 second drop when I build a rifle. Not to say less is bad... It's just what I look for when pairing a cylinder and piston.

I will say that if my rifle was having cycling issues, barring any obvious parts failure, mag issue or otherwise... I would first look at the gas system. Carbon build up, loose plug, and worn/mismatched piston/cylinder are all common causes of cycling issues. Especially when it comes to failure to feed/chamber/eject in semi auto, in an otherwise perfectly functioning rifle.

Unfortunately, spare, new , chinese parts aren't easy to get without buying a bunch of rifles.
 
pizdets17 said:
So do you suggest me buying this $39 piston at brownels as a start? Mine does feel pretty loose in there..
Click to expand...

Typically, NON chinese pistons do not function in chinese cylinders. Diameter of the chinese piston and corresponding cylinder wall are larger than parts made to "GI" spec.
There have been some exceptions, but the general rule is no, a U.S. sourced, non chinese piston doesn't fit any better than a loose chinese piston

Try Marstar or maybe Canada ammo or one of the other large volume m305 retailers... Maybe lever arms , sfrc, ect and see if they have any spare new chinese pistons.
 
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