This come from seeing the character using the bipod in the prone position, but just to keep it constant place the character’s left hand on the buttstock of LMG when using the bipod.
Like this
or this
Placing the supporting hand on the buttstock when the bipod is active make the character action and intension more believable, it also fix the rendering issues below.
The hand placement distance increases from the character’s body making it stretch out the supporting arm too far.
The character’s arm clipping through the gun.
