Is the WK/MCR Factory Default Gas Setting Adverse Mode?

BUMBLE SPECIMOODA said:
No. Bolt stationary, then open valve just enough to make it cycle consistently. Like jetting a carburator.
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If we are going to use the carb and fuel analogy, it sounds like yours is running with the fuel disconnected from the gas tank.

Enjoy your rifle and the mods your making to it!
 
My comment was in relation to this:

BUMBLE SPECIMOODA said:
Well, was messin at the range with the set screw fully closing off the vent. The gun still worked. Worked good too. I think the force from inside the barrel, was directly blowing back the bolt.

Any feed back from youz guys, as to what's going on?
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btw, I'm quite familiar with how a carburetor works...
 
According to Reddit r/CanadaGuns, Apparently some of the WK Gen2s are expelling a lot of gas out the fore-end. Not good for people's hands, gloves, or M-Lok covers, but I wonder if this means less gas into the piston system on the Gen2?
https://www.reddit.com/r/canadaguns/comments/usmcjm/wk180c_gen_2_concussion_from_gas_block/
https://www.reddit.com/r/canadaguns/comments/uswfvr/tell_me_you_own_a_wk180c_without_telling_me/
https://www.reddit.com/r/canadaguns/comments/uticlt/wk180c_gen_2_gas_update_magpul_mlok_type_1_covers/
 
Ustauk said:
According to Reddit r/CanadaGuns, Apparently some of the WK Gen2s are expelling a lot of gas out the fore-end. Not good for people's hands, gloves, or M-Lok covers, but I wonder if this means less gas into the piston system on the Gen2?
https://www.reddit.com/r/canadaguns/comments/usmcjm/wk180c_gen_2_concussion_from_gas_block/
https://www.reddit.com/r/canadaguns/comments/uswfvr/tell_me_you_own_a_wk180c_without_telling_me/
https://www.reddit.com/r/canadaguns/comments/uticlt/wk180c_gen_2_gas_update_magpul_mlok_type_1_covers/
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having looked at those pics, that's crazy! issue...? my gen 1 doesn't do that. i mean it vents of course but that seems a bit excessive
 
Both generations do it, as do most semi-autos. The AR does it too - it's just that the venting is built into the bolt carrier, and why, especially on a suppressed AR, venting can come back through the charging handle area. It's excessive in the WK because they chose to go with a Carbine length gas system. The closed up tolerances in the design of the WK gas system also means there is very little tributary leakage around loose fitting parts which is a likely assisting with parts failure in my estimation due to higher than needed port pressures. If you consider that it being so over gassed and the issues that some are having with the internals and abnormal wear in the upper receiver, the gun is likely beating and eating itself to failure.
 
So, if I were to get a barrel with a mid length Gas port would that solve the gas issue?
Or do I need rifle lenght?
 
45C said:
So, if I were to get a barrel with a mid length Gas port would that solve the gas issue?
Or do I need rifle lenght?
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Good question. The Crusader Sentinel went with a thickened mid length piston. The Sterling R18 went with a multi-part rifle length piston; the multiple parts allow more flex and give then a single piece. The upcoming SBI DI BCG for their Lynx and the WK/MCR removes the piston entirely, probably venting out the side of the BCG through the case ejection port when the BCG is forward, like with an AR-15 or the Jard J180. It will be interesting to see which of these work best long term.

You can get a mid length piston and matching port barrel from Third Echelon, and a rifle length piston and matching port barrel from True North Arms. Heard good things from both on here.
 
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Ustauk said:
According to Reddit r/CanadaGuns, Apparently some of the WK Gen2s are expelling a lot of gas out the fore-end. Not good for people's hands, gloves, or M-Lok covers, but I wonder if this means less gas into the piston system on the Gen2?
https://www.reddit.com/r/canadaguns/comments/usmcjm/wk180c_gen_2_concussion_from_gas_block/
https://www.reddit.com/r/canadaguns/comments/uswfvr/tell_me_you_own_a_wk180c_without_telling_me/
https://www.reddit.com/r/canadaguns/comments/uticlt/wk180c_gen_2_gas_update_magpul_mlok_type_1_covers/
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so, if there is more gas getting out around the gas block then:

- perhaps the new gas block mounting system they used is causing it. ie, the set screws are backing off (like they did before) so there is a gap between barrel and block that is letting the gas through but the new c-clip is keeping things in place so users didn't know.
- they used a larger gas vent in the barrel so more gas getting dumped once piston has cycled rearwards.
- piston is cycling faster/easier due to reduced tolerances (ie, perhaps they fixed some of the tight chamber issues they've been having) resulting in more waste gas.
 
45C said:
So, if I were to get a barrel with a mid length Gas port would that solve the gas issue?
Or do I need rifle lenght?
Click to expand...

Go rifle if you can source the parts.
I pieced together a rifle length gas system from TNA for a fellow that is running a Gen. 1 WK and mated it with an Armalite 20" SS match barrel that had some miles on it I had kicking around...
Took it out after the build for function testing and it was way more in line with how these should shoot. All subjective of course. The following is a good summary of dwell time (on ARs), and why it matters.
This will be even more prevalent on a 180 clone as the there is far less time for the gas to travel and actuate the piston than on an AR

https_://progunmillennial.wordpress.com/2019/07/26/what-is-dwell-time/
 
Was looking on IBI site and crap the prices sure have jumped.
Semi barrel has increased by 50% since last year.
 
Ian at Forgotten Weapons posted a video that includes a tear down of the SIG MCX, which he describes as an AR-15/AR-180 hybrid, https://www.canadiangunnutz.com/forum/showthread.php/2280432-Forgotten-Weapons-SIG-Spear-Videos?p=18913900&viewfull=1#post18913900. His notes on the how the Spear works to reduce wear echo the inverse why things may have gone wrong with the WK and to a lesser extent the MCR.

Ian at Forgtten Weapons on the MCX Spear said:
So there are your two gas ports. And then this is your short stroke piston.
So when the gun fires, that piston is going to get pushed back. It is going to press on this operating rod, which pushes the whole bolt assembly backwards.
I think ... there's a misunderstanding, and there's a likelihood that people are going to assume that a lot more is going on under high pressure than really is. So the bolt, for example, does not have to weigh more than, for example, the original AR-10 bolt.
Because this bolt is not necessarily moving at any greater velocity because it's a high pressure cartridge than it would be if it were running standard .308.
The bolt velocity is determined by the chamber pressure when the bolt unlocks, how much force is actually pushing the bolt back at that point. What SIG has done is put a gas port on here that is relatively far forward.
It presumably has a relatively small actual gas port in the barrel.
They've regulated the amount of gas that's going to come through here to push back on the bolt.
That is going to contribute to the opening velocity of the bolt. And then by choosing where they set the gas port, they can determine how much pressure is actually going to be left in the barrel, and how much force is pushing backwards here when that bolt opens.
So that's why we see the bolt being the same weight as an original AR-10 bolt. The recoil spring is nothing particularly special as far as I can tell, because it doesn't need to be. The operating velocity of this bolt is pretty normal, unlike the operating pressure of the rifle.
Once it can do that ... then you're managing bolt velocity by determining how quickly the bolt is going to open, which is largely determined by placement of the gas port here on the barrel, as well as the size of the gas port itself.
Too much gas and you will open the bolt faster and increase bolt velocities, which we want to avoid.
That's the sort of thing that puts wear and tear on other parts of the gun.
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