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airsoft weigth and accuracy

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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airsoft weigth and accuracy

Unread postAuthor: Demon » Wed Feb 03, 2010 3:28 pm

http://www.redwolfairsoft.com/redwolf/a ... ulletID=70

I have found some tests results with an airsoft sniper.
There where different weights and what is pretty surprising is that the .3g won and beated the .43 ultra heavy bb. It would be due to the ineficient hop-up with heavy bb's.

I am currently machining an airsoft sniper with homemade hop-up and was going to buy .43 BB's, but then i saw that website...

What should i buy then? I want to be able to hit a soda can at 20m just enough to knock it off. .43g or .3g ? Maybe even .25?

EDIT:

http://www.redwolfairsoft.com/redwolf/a ... odID=26223

Can it simply be as the .3g is in the precision grade section? Even tough, they are all .01 mm ...
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Last edited by Demon on Wed Feb 03, 2010 3:35 pm, edited 1 time in total.
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Re: airsoft weigth and accuracy

Unread postAuthor: ramses » Wed Feb 03, 2010 3:35 pm

Demon wrote: I want to be able to hit a soda can at 20m just enough to knock it off. .43g or .3g ?

EDIT:

http://www.redwolfairsoft.com/redwolf/a ... odID=26223

Can it simply be as the .3g is in the precision grade section? Even tough, they are all .01 mm ...


You could most likely do that with a .20g. The inaccuracy of the .43's was most likely because the hopup wasn't designed for these BB's. They are over 2x as heavy as the "normal" ones. They would have also been moving at a slower velocity. In any homemade, especially non-spring powered gun, there will be more than enough power to propel them.

good luck!
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Unread postAuthor: Demon » Wed Feb 03, 2010 3:38 pm

inaccuracy of the .43's was most likely because the hopup wasn't designed for these BB's.


So then will it really be a problem to make a solid enough hop-up? I plan to use a screw that would push on an heat-shrink around the barrel.

I will post a schematic.
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Unread postAuthor: Demon » Wed Feb 03, 2010 4:07 pm

double post

The blue is 6.04 barrel

The yellow is home machined out of aluminium

the red is heat shrink shrinked to the barrel( maybe also glued )

The screws are 8-32
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Unread postAuthor: Davidvaini » Wed Feb 03, 2010 4:14 pm

with the heavier BB, more force is put upon the hopup.

Heavier BB and higher power means you need a harder type bucking. This means more of a rigid ruber than a lose rubber.

With the hopup combo used in those kinds of tests, you will actually see more accuracy in the lighter weight BB.

Heavier BB of the same size will always have the potential to be more accurate, its just in a lot of cases of aftermarket hopup units and parts it isnt the case.

hope that helps.
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Unread postAuthor: Demon » Wed Feb 03, 2010 4:30 pm

So what about this one ? The 8 -32 screw with the rubber at one end would seal with teflon tape and the casing would be hot glued to stop leaks.

Would a plastic or aluminium hop-up be a good idea?
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Unread postAuthor: ramses » Wed Feb 03, 2010 8:05 pm

Either should work. It mostly depends on the type of rubber you use. Have you ever seen a stock commercial hopup? they're not exactly beefy...
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Unread postAuthor: Marffy » Wed Feb 03, 2010 8:47 pm

i would use .3g bbs or if they had anything in between like .34g (which i think they have)

Off topic: i found that when i spilled bbs on the ground and didn't pick them all up and used them in one of craptastic springs it actually gained accuracy because dust or dirt or something stuck to the bb and made it gain weight. it was awesome! even though its bad for airsoft guns. I just had to say this. i though it was a cool story. and a cool idea for those with crappy springers i guess.
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