Just filled out my background check papers today on my M&P 10 my first "AR"
I will be picking it up in 10 days ( I live in the "Peoples Republic of Kalifornication" )
I would like some advice on some reasonably priced BUIS. The shop keeper said I could not use the polymer types on the front because of heat buildup on the top rail of the gas block.
Also do you have to get a set that is set up for the different rail hight between the gas block and the top reciever?
Would I be better off to save the money spent on BUIS and put it into a good optic and mount?
Any advice would be much appreciated.

I would like some advice on some reasonably priced BUIS. The shop keeper said I could not use the polymer types on the front because of heat buildup on the top rail of the gas block.
Also do you have to get a set that is set up for the different rail hight between the gas block and the top reciever?
Would I be better off to save the money spent on BUIS and put it into a good optic and mount?
Any advice would be much appreciated.
