What power should i use for my TM M9?

[Petar]

Hello guys,

I need help with decision about PSI for my Tokyo Marui M9 GBB.
I'm buying new can of duster spray,but I'm not sure which PSI/Bar should i chose,because like you know,Tokyo Marui is made of plastic,so I'm worried that i will break it if i chose stronger.
Until now i used duster,and i couldn't get slide to lock (i tried green gas and it works normal)and i think it's because it's too weak,but i can't be 100% sure because i couldn't find PSI on duster's can.
Now I'm in dilemma should i use 5 Bar (72 PSI) or 6 Bar (87 PSI)?
I'm always shoot indoors so temperature is 75-81 F.
However summers are hot here in Croatia,so I'm worried that gun will break in hot days if i use 6 Bar.
In summer temperatures are between 91-95 F.

I want to prolong gun's life as much as i can,and i want to keep internals in best condition possible,so i won't use green gas so keep in mind of that.

Every comment is welcome

 

[Monty]

Just use 144a gas, no need to over complicate things.

 

[Petar]

There is no 144a gas in Croatia,and shipping to my country is really expensive.

That's why i only have access to computer compressed air-duster.

Also,many if not all IT stores here have dusters without HFC.

Green gas is also not an option because i want to prolong gun's life as much as i can.