Just go test it out. If I am wrong about suppressor 2 having better range, I will give the person that proves me wrong my account name, password, PS2, Socom 1, 2 and 3 and will never play Socom ever again.
Ive always wondered which silencer gives you better range myself and decided to test them out. With ALL guns capable of having both silencers, (M4A1, IW80A2, HK G36 and the M

there was a 10 - 15 meter advantage when silencer 2 was used. All of the testing was done in Devil's road with the range as reported by the Medium scope.
For whatever reason, the descriptions are backwards. Silencer 1's description should be Silencer 2's description and vice versa. I first noticed this when I read the descriptions and then looked at the attachment's "stats". The stats are whats accurate. If you look at Silencer 2's stats, it shows more range. Also when you put Silencer 2 on your weapon and look at the range of the weapon when compared to Silencer 1, it is higher.
These are all facts people. Look them up for and try them out for change instead of just refuting it because your clanmate's friends brother's dad's friend works for Zipper and says this about the game. Maybe you'll actually learn something. Stop being so ignorant.