Am looking at a Hastings 12 ga. 30" VR barrel for a Rem. 870.Never having seen a Hastings wad lock barrel I at first thought it had steel shot damage running full length I.D. but not into the choke tube. There are 12 evenly spaced lines/grooves down the barrel. Is this a WadLock barrel? Are choke tubes still available now that Hasting is no longer in business? Thanks again.