Old school achievement question: Are sniper scopes allowed?

[flashn00b]

Would using the sniper scope disable the old school achievement for your current playthrough?

[Matexterminator]

They're possibly allowed since previos serious sam games have them, but i'm not sure.

[keiskay2]

sniper scopes are old school so it should be fine.

[PGuybrush]

I wouldn't risk it.