Questions, I just bought a Remington 17 with rib barrel and PolyChoke. With all the Poly's and Cutts around, did the factory do any installation or did they all send there barrels out for install? I remember as a kid, late 50's, that I sent to the Poly company for their catalog and received thru the mail a box for sending in my barrel. Also, the end of this Poly has an extension that appears to be ventalated much like the front end of the Cutts. What's the function? My brother has a Poly on a Mdl 12/16ga. and his does not have that. Is it an early attempt at recoil reduction? BTW, has anyone done a history or write up on the PolyChoke and Cutts? And how effective is the Poly on choke function. Thanks for your reply. Randy