417 Upper Brass Deflector Question?-hk4171.jpg417 Upper Brass Deflector Question?-hk4172.jpg

Hopefully you can see the pics but they show the upper on a 417 parts kit purchased from Brownells BE date code...brass deflector has a hex screw thru the back and it looks like the face of the brass deflector can be removed and the deflector is obviously not welded in the design of the upper. Does anyone know if these are common or have any other info?

Thanks so much! AK