Weapon Unlocks - Battlefield 3 wiki
General
Rank 1 - 870MCS
Rank 4 - G17C
Rank 7 - PP-2000
Rank 10 - M9 TACT.
Rank 13 - MP443 TACT.
Rank 16 - UMP 45
Rank 19 - G17C SUPP.
Rank 22 - M1014
Rank 25 - M9 SUPP.
Rank 28 - MP443 SUPP.
Rank 30 - G18
Rank 32 - PDW-R
Rank 34 - SAIGA 12K
Rank 36 - .44...