I need pro feedback A.S.A.P

So You've all convinced me to buy the JG BAR-10 sniper rifle. I just need to know some things first. P.S I've looked at the modding forum for it and several questions stem from that.
1 Should I get the G-SPEC or normal one?
2 After Doing the modifications on this site will I be able to add these to it without it breaking or such?
http://www.airsoftpost.com/laylax-perfect-sniper-system-pss10-603mm-inner-barrel-vsr10-bar10-430mm-p-31179.html

http://www.airsoftpost.com/laylax-pss10-spring-vsr10-series-airsoft-sniper-rifle-p-31186.html

3 Is this an upgrade or just replacement parts?
http://www.airsoftpost.com/metal-hopup-chamber-tokyo-marui-vsr10-bar10-series-airsoft-sniper-rifle-p-30786.html

$ pretty much the same as 3 but what's this do?
http://www.airsoftpost.com/parts-bar10-tokyo-marui-vsr10-bolt-action-airsoft-sniper-rifle-magazine-catch-assembly-p-30850.html

thanks for the help. please messege back soon!

Seriously no one has anything to say to me? wow thanks!

sorry didn't get time to read this question
ifi were you, i would get the G-spec version, so that you can silence it after doing the airbrake mod

im sure you can add the barrel, just not sure about the spring

as for the hop up, and magazine catch, those are replacements

Cool thanks I didn't want to do the mods then have the spring rip apart my gun.
So the gun's hop up system is already metal???
And do you think it'd be better to use the spring without the airbrake mod??

Ok if you want some advice read this because I have used both and own one. I would get the regular one because it does have a longer barrel, and the silencer for the g-spec you can get a an adapter so that you can put it on the regular one also. Then I would say get a new barrel and the one i have I got from airsplat and it is actually good. It is a 6.01 tight bore. Then I would go buy some #4 (by 32 i think bring one off the gun along) metric screws to replace all the screws you can like the two that hold the stock to it (those are a different size) and also find some good adhisive so lock some screws in if you don''t plan on upgrading the trigger, but if you do go with the latax zero point trigger with the piston and get a new chamber and hopup unit, and a new spring like a m200 perhaps. I would also suggest that you get a bipod if you get all of that because you will be able to make over 100yd shots. I only have the new barrel and I can go 75y about 90% of the time. Also if you do this you have to oil often and use very good bbs .30g and up.

cool thanks but do you think the sping mod I picked would be a bad idea tocombined with the airbrake mod???

Well what spring mod and I have not done the airbrake mod. I can go test it in a bit becuase im getting rid of my bar.

also I forgot to add that if you get the spring you have to get the new trigger and pistion. Also you don''t need the mag chatch thing unless you realy think you will lose it. I just put a pice of paper that I taped to it over it so it could not pop out.

how much would the trigger and other thing cost????

well one of the best there down to $150 (pss10) but there are others I just don't know the product names.