Specifically, the Smith M&P Sport II AR 15. Sold everywhere with the iron sights and 30 round mag. Want one to shoot on and near my remote rural mountain property in far far upstate NY, and will travel to and from this property from out of state, by auto, on interstates and state highways.
Gun shops with armorer service in NY are telling me it takes a flash suppressor removal, recap barrel end and weld, somehow pinning the stock so no retract, and of course the 10 round mag "permanently" fixed.
Others say no, just do the 10 round fixed mag, and do the little white epoxy thing that makes it so a competent DIY can change things out again so you can use your 30 round mags when at home in your free state.
No one here in my FL location can help as they, the gun shop salesmen and the gunsmiths, don't know the ins and outs of the NY law.