About: http://webisa.webdatacommons.org/286543152

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Keep in mind that a decent gunsmith can ream and thread a fixed choke barrel for a screw in choke for not too much (around $100 last time I checked, but that was a few years ago - not including price of choke tubes).
http://www.w3.org/ns/prov#wasQuotedFrom	thefiringline.com