Splinter Cell: Conviction Message Board  

Is there any way to unlock all weapons in the game such as SCAR and AK-47 without visiting Uplay and exclusive content or ...
?

Nope. Not that you'd need to. It's as easy as just logging on and getting the weapons; there's no strings attached, you can just grab them right off the bat.

there is always a way , i don't know it yet , but in xbox 360 there is , in PC , not yet , i think there will be something soon , maybe using hix to edit profile will do it , don't know how though

Unfortunately, I have not once actually been able to access Ubi servers from within the game. Which makes this real fun.

only way i know of is the content one