Spend the indicated amount of Intel points at the Bonus menu to get the corresponding weapon:

AS9: 60 Intel Points
GL69A: 100 Intel Points
M249SPW: 80 Intel Points
MP7SD: 40 Intel Points
MTAR-21: 70 Intel Points
P90TR: 80 Intel Points
SPAS 15: 40 Intel Points
SR-4 CQB: 100 Intel Points
U100MK3: 60 Intel Points
UMP-9: 50 Intel Points
USAS 12: 70 Intel Points