Brand new jg bar 10 won't cock and shoot...

Usual disclaimer: Send it back.

Can you fire it with the bolt back? (Don't let it slam fire, just see if it releases the spring tension). Is there clearly resistance from the spring when you pull the bolt back? This should allow us to rule out the sear.

 
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Not sure how much Spring resistance there should be but I can take the bolt back with 1 finger and light pressure.

It won't fire with the bolt open and to the rear

 
Disclaimer, noted and ignored haha!

Actually it may be cocked but the trigger won't release the spring ?

 
If the spring is compressed and not releasing it's a trigger mech problem usually ;something isn't allowing the sear to displace or there's nothing actuating it. It could be a catastrophic cylinder issue where the piston is completely stuck, but that's very unlikely.

Again, seriously consider sending it back because to fix this you will probably have to void something.

You need to rebuild the trigger mech. Probably just a rogue spring, but it could be that something has snapped and that's why I'd advise you send it back unless you're getting a new trigger mech. This link explains it better than I can: http://www.airsoftsniperforum.com/41-vsr-rifles/3165-worstinfinland-s-vsr-10-total-take-apart-guide.html

 
Cheers mate...stripped it, pulled the spring guide stopper out, lubed everything re built and it works !!

 
Nice. Probably just a loose spring then - something that's more common in stock VSRs than some others. They have a slightly more complicated trigger mech than say the Maruzen L96 clones.

 
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I had a snapped sear return spring in my VSR the other weekend, meant couldn't cock it, replaced spring with a rubber o-ring and now it works better and smoother than from new! :-)

 
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