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Old 06-08-2020, 08:23 PM   #1
Myzur   Myzur is offline
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CO2 pistol problems

I got the new Sig P320 as my sidearm for sniping/DMR as I own a real P320 and wanted the same feel for my carry pistol but have run into a huge problem. My CO2 Sig is firing about 2.03J on average, which is waaaaay too hot for the field. Has anyone had this problem before and is there a quick fix to bring that down without swapping to green gas mags?
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Old 06-08-2020, 08:41 PM   #2
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If it takes standard GBB barrels then I would recommend using a really wide bore in somehow extending the crown as far back as you can.
Or you could get some UHMW tape or hard rubber and put it on your valve knocker or the little pin part on the valve.
Or maybe try to change the spring that powers the knocker to a much weaker one.


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Old 06-09-2020, 10:09 AM   #3
Myzur   Myzur is offline
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Ok I may try the uhmw tape on the gas valve for the mags in order to bring it down, that seems to be the least invasive way
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Old 06-10-2020, 07:07 AM   #4
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Quote:
Originally Posted by SiliconeSword View Post
If it takes standard GBB barrels then I would recommend using a really wide bore in somehow extending the crown as far back as you can.
Barrel crowning tool available here: https://www.ebay.co.uk/itm/Gunsmith-...-/130735761109
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Old 06-10-2020, 11:29 AM   #5
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Quote:
Originally Posted by BlackDogAirsoft View Post
Barrel crowning tool available here: https://www.ebay.co.uk/itm/Gunsmith-...-/130735761109
That is fine and all but won't make that deep of a crown, so I doubt it would really affect too much in terms of power.

Use these instead
https://www.shapeways.com/product/P6...-crown-cutter-

https://www.ebay.com/itm/12pc-5gram-...Lapping-Paste-


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Old 06-10-2020, 11:53 AM   #6
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I'm not familiar with the SIG P320, but all gas blowback guns share pretty much the same design when it comes to handling the power: a floating valve inside the nozzle. If that's the case, shimming it at the back so it rests further forward will take the power down, as it will cut the flow of gas towards the barrel sooner.

Doing anything to the barrel is an awful idea, as it will work by making the system ridiculously inefficient and is likely to destroy your accuracy.
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