No mags over 20 rounds I believe and if you have it in the car, either have it your person (open carried) or in plain sight. Some folks have a holster secured to the dash board or have a rig that attaches to the shoulder strap of the seat belt so it sits on the back support of the seat. Call VSP to verify, just in case. Happy Open Carrying!!
"Laws that forbid the carrying of arms...disarm only those who are neither inclined nor determined to commit crimes...”-Thomas Jefferson