It's kind of a mess, so here is a quote from the thread:
EmeraldRHINO_Mk_II wrote:Here are some trends I've noticed:
Suppressors:
-20% bullet velocity on SMGs
-35% bullet velocity on carbines
-40% bullet velocity on other weapons
-50.5% bullet velocity on the Railjack (because screw that weapon, right?)
Suppressed Beamer velocity reduced by only 12% unlike other weapons (who knows why) No other pistols are included on the list, so I assume that applies to all pistols until shown otherwise.
High Velocity Ammo:
+5% bullet velocity on most weapons*
+10% vertical recoil on everything except battle rifles (+7.5% on those)
*Exceptions: T32 Bull + CME (672)
Gauss Rifle Burst + Gauss SAW-S + Razor GD-23 + Reaper DMR + T1B Cycler + T5 AMC + T9 CARV-S + Corvus VA55 + Equinox VE2 Burst + SVA-88 (650)
Gauss Compact Burst + HC1 Cougar + TRAC-5 Burst + Solstice Burst (600)
AC-X11 + NS-11C + Pulsar C (550)
Soft Point Ammo:
-5% bullet velocity on all weapons
Compensators:
+35m to minimap detect range (normally 50m for LMGs, 40m for other weapons)
-15% Vertical Recoil (Exceptions: AC-X11 (20%) Reaper DMR + SABR-13 (25%))
+20% Hipfire Cone of Fire
Flash Suppressors:
+20% Cone of Fire increase per shot
Forward Grips:
+100 to 150 milliseconds to equip time for most weapons (20ms for shotguns, 50ms for SMGs)
-25% Horizontal Recoil per shot (33% for advanced forward grip)
-0.5 degrees Maximum Horizontal Spread tolerance
-15% Vertical Recoil on sniper rifles (beats me)
Laser Sights:
-33% Hipfire Cone of Fire (-40% with Advanced Laser Sight)
Slug Ammunition:
+75% Cone of Fire
Baron projectile velocity reduced to 300 (from 400)
High Velocity Ammo Exceptions
T32 Bull: 670 -> 672 (0.3%)
CME: 670 -> 672 (0.3%)
Gauss Rifle Burst 650 -> 650 (0%)
NC6S Gauss SAW-S 630 -> 650 (3.2%)
Razor GD-23 560 -> 650 (16.1%)
Reaper DMR 555 -> 650 (17.1%)
T1B Cycler 580 -> 650 (12.1%)
T5 AMC 570 -> 650 (14.0%)
T9 CARV-S 600 -> 650 (8.3%)
Corvus VA55 600 -> 650 (8.3%)
Equinox VE2 Burst 615 -> 650 (5.7%)
SVA-88 630 -> 650 (3.2%)
Gauss Compact Burst 500 -> 600 (20%)
HC1 Cougar 520 -> 600 (15.4%)
TRAC-5 Burst 490 -> 600 (22.4%)
Solstice Burst 515 -> 600 (16.5%)
AC-X11 480 -> 550 (14.6%)
NS-11C 450 -> 550 (22.2%)
Pulsar C 515 -> 550 (6.8%)
Flare VE6 600 -> 650 (8.3%)
