I should add tha this is approximate, from my testing I noticed that the time varies regularly.
Weapon name: Reload time: (ms)
Pistol: 1298,9965
PistolMk2: 1296,9964
CombatPistol: 1297,0026
Pistol50: 1303,0028
SNSPistol: 1306,999
SNSPistolMk2: 1308,9942
HeavyPistol: 1308,0031
VintagePistol: 1305,9949
CeramicPistol: 1294,9983
MarksmanPistol: 1435,9979
Revolver: 1942,9933
RevolverMk2: 1937,0011
DoubleActionRevolver: 1948,9977
NavyRevolver: 1802,9999
PericoPistol: 936,9958
WM29Pistol: 1302,0036
APPistol: 1307,0017
FlareGun: 1306,9992
MicroSMG: 1417,9973
MachinePistol: 1191,9996
MiniSMG: 1196
SMG: 1647,0039
SMGMk2: 1648,9949
AssaultSMG: 1229,0026
CombatPDW: 1651,994
AssaultRifle: 1103,0039
AssaultrifleMk2: 1219,9936
CarbineRifle: 1024,9951
CarbineRifleMk2: 1135,9992
AdvancedRifle: 1187,002
SpecialCarbine: 1322,0025
BullpupRifle: 1148,9981
SpecialCarbineMk2: 1334,994
BullpupRifleMk2: 1271,9983
MilitaryRifle: 1302,0029
HeavyRifle: 1342,0004
ServiceCarbine: 1021,9949
SniperRifle: 1423,0009
HeavySniper: 1483,9991
HeavySniperMk2: 1494,0108
MarksmanRifle: 1095,9991
MarksmanRifleMk2: 1092,9971
PrecisionRifle: 1433,9984
PumpShotgun: 1295,9985
PumpShotgunMk2: 1339,9925
SawnOffShotgun: 1300,9988
BullpupShotgun: 1242,0278
AssaultShotgun: 1219,9948
Musket: 2504,0036
HeavyShotgun: 1093,9962
DoubleBarrelShotgun: 1312,9953
SweeperShotgun: 1419,0014
CombatShotgun: 2115,9893
GrenadeLauncher: 2435,9951
RPG: 1601,9955
Firework: 1620,0106
Railgun: 1057,0019
HomingLauncher: 2005,9967
CompactGrenadeLauncher: 1299,9975
CompactEMPLauncher: 1315,9989
Don't know if it is helpful but either way it is here.