Are you supposed to get a weapon attachment at 50 kills with the dsg sniper rifle, or not? cause I only got 1 at 20 kills, but at 50 i didn't, even though i swear i saw an icon for the attachment.

At 50 kills with the scar I got another attachment.

And is there a site that actually has all this information listed?

Thanks.

Yes, you should get new attachment at 50 kills...
It's probably bug in game.
Are you on 5th reboot?