Madbull Airsoft have some new accessories for your M4:
COBRA SERIES TRIGGER GUARDS LICENSED BY STRIKE INDUSTRIES
Featuring unique ready-position finger rests for your trigger finger.
Cobra Series trigger guards are designed as direct replacements to the standard AR trigger guard. These trigger guards feature a deeper angle rather than a straight linear line.
This gives the operator more room when wearing gloves and for cold weather environments, as well as eliminating the dreaded gap between the pistol grip and trigger guard.
Note that these licensed versions of the Cobra Series trigger guards are specifically manufactured to fit Airsoft rifles.
More info & photos: www.madbull.com/cobra