Here is a list of real firearms and firearm manufacturers mentioned in rap music. No slang, only real stuff

Specific firearms:
AA-12
AK-47
AK-5
AK-74
AR-15
Calico M960
Carbon 15
Desert Eagle
Draco
FAMAS
FN Five-seveN
FN P90
FNP 40
Floro PDW
GSG-5
Glock 17
Glock 18
Glock 19
Glock 20
Glock 21
Glock 22
Glock 23
Glock 24
Glock 25
Glock 26
Glock 27
Glock 28
Glock 29
Glock 30
Glock 31
Glock 32
Glock 33
Glock 34
Glock 35
Glock 36
Glock 37
Glock 38
Glock 39
Glock 40
Glock 41
Glock 42
Glock 43
Glock 44
Glock 45
Glock 46
Glock 47
Glock 48
HK 416
HK G36
HK MP-5
HK MP-7
HK VP9
Haskell JS-45
INA Ingratek
Ithaca 37
Kimber K6S
Luger
M16
M1
M21
M4
M9
MAC-10
MAC-11
MAC-12
Master Key
Mekanika Uru
Mossberg 500
Mossberg 935
P96
Remington Model 11-87
Robinson Armament XCR
Ruger Blackhawk
Ruger Mini-14
Ruger P89
Ruger P90
Ruger SR9
SIG Sauer 1911
SIG Sauer P226
SKS
Smith and Wesson
Knight's Armament Company SR-16
STI 2011
TEC-9
Uzi
Walther P38
Walther PPK
Firearm companies:
Colt
ArmaLite
Beretta
Glock
Heckler & Koch
Kel-Tec
Intratec
Mossberg
Ruger
SIG
Taurus
Winchester