Went and bought a choke for my model 120 Ranger 12ga. yesterday, it uses a Win-Choke style choke the guy at the gun shop gave me a standard invector choke and said it will work in my gun. He said the only difference is it is flush mount as were the win-choke has the knurled end on it, it says on the box not for use with barrels marked Win-Choke. Is this choke ok to use or does the guy at the shop not know what he's talking about. Any info would be greatly appreitiated. Thanks in advance Chad.