Step 1: Take any weapon suitable for installing the “Fore Grip” modification. For greater clarity, I recommend installing any "Scope" modification in advance with the highest possible magnification.
Step 2: Shoot while aiming.
Step 3: Install "Fore Grip" modification
Step 4: Fire this weapon again while aiming
Expected Result: The "Fore Grip" modification does not provide any improvement in aiming mode
Actual result: Installing the "Fore Grip" modification increases accuracy and handling in aiming mode. Note: Based on the description of the “Fore Grip” and “Bipod” modifications, I assume that the function of accuracy and handling in aiming mode, which the “Fore Grip” modification has, should be available in the “Bipod”, but the installation “Bipod” modification does not give any effect. Additional videos: Sniper Rifle / Fore Grip
Auto Shotgun / Fore Grip
AK-47 Machine Gun / Fore Grip / Bipod