The only gun I know for sure so far that can be mutli Pack-a-punched is the pistol you buy on the bus. But I'm pretty sure there are lots more guns that can do it.
Anybody have any guns they can list off the top of their head?
I think you can multi PaP all guns which have multiple Sight attachments on MP.
I'm pretty sure all of the weapons available in the regular multiplayer of bo2, can be pap'd multiple times. The attachments that multi pap guns use, were not designed for use with older guns like the ak-74u. I think you can pap an older gun twice, the damage will increase but you wont get different attachments.
Type 25, Executioner, HAMR, LSAT(Nuketown only), Five-seven/Dual wield, KAP-40, War Machine(?), S12, M1216, Remington 870 MCS(?), Chicom CQB, MTAR, DSR 50(?), M8A1.
The (?) signifies that I did not PaP them before but assumed to be able to be PaPped without limits.
You can pack a punch all 2025 weapons including guns without thEm needing to have multiple sights