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Systema PTW Basic Info and FAQ

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Old February 1st, 2017, 21:34   #466
ThunderCactus
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Join Date: Feb 2007
green devils are like the universal standard of PTWs so yeah those are perfect.
If you're using an 11.1v lipo, the gun could very well be cycling too fast to allow proper feeding. If it works better with .25g BBs then the mag springs are for sure the issue.

Chopping BBs happens due to the air nozzle closing down on a BB then the piston slamming into it and shearing it in half.

Now that you've had chopping in your gun though, you should take the cylinder apart to clean it. BB chunks tend to make their way back through the air nozzle.
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Old February 2nd, 2017, 09:28   #467
azlann
 
Join Date: Jan 2017
Never had chopping, just suspected that it could be the same behaviour, just with less bb crushing .

Got some 7.4v's as well, I'll try those to see if that makes a difference. Thanks again.
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Old February 2nd, 2017, 15:21   #468
ThunderCactus
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If the mag springs are too strong, the spring of the air nozzle won't be able to overcome the upward force of the next BB. Similar effect occurs; BB gets shot out at very low velocity, but BBs don't get blown apart.
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Old February 2nd, 2017, 21:04   #469
mcguyver
 
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Join Date: Aug 2005
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Green devils are all over the place in size, polish and spherical perfection. One bag is OK, next bag unusable.

I stopped using them.

No longer PTW-worthy.
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Old March 7th, 2017, 21:21   #470
JosiahJohn
 
Join Date: Dec 2007
Does anyone know where to buy ptw o rings in north america? Specifically I am looking for piston head, nozzle and cylinder head o rings. This thread suggests polyurethane o rings, will urethane o rings work as well? And what shore is suggested?
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Old April 6th, 2017, 13:32   #471
derek240
 
Join Date: May 2007
Location: Richmond Hill
I have two systema motors I need rewound, anybody have a direct contact for someone? I've pm'd mcguyver already, haven't received a reply yet.

One motor is a stock 2007 490 motor, second is a systema kumi 7511 motor

Thanks in advance
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Old April 6th, 2017, 13:48   #472
xav1982
 
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Mcguyver dont rewind motors himself iirc, he send them to tackleberry in the UK
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