Anyone here own one of these rifle? any real first hand information on how these rifle are build and shoot would be appreciated. Bonner

Here's a pic of the breachblock on my 32 Bay State.
The sliding dovetail allows both rim and centerfire ammo.
Aaron

     Let me clarify my botched note from December 2017.  William Davenport and his brother-in-law, Day started the Bay state company in 1885 and patented a rifling machine and the convertible rim to center fire breech block that year.  They sold out to Hopkins and Allen in 1887, no doubt for the patents and machinery.  I cant find evidence of any quality H&A rifles until that date.   
     I bought a nice Bay State rifle relined and chambered in 32 S&W Long a few months ago and the quality of workmanship was nice.  The fellow who relined it did not get around to sliding the dovetailed section of the block to center fire, but having a copy of the patent from Cornell, it was easy, one set screw to loosen, then a brass punch to ease it over to the center fire position and snug up the set screw.
     W.H. Davenport left H&A in 1890, started the W. H. Davenport company and made single shot shotguns until 1891 and then made rim fire rifles, well made ones.  He seemed to persist in quality over mass production.  He retired about 1905, died soon afterwards, and his brother continued for a few more years, then again sold to Hopkins and Allen.

James

That Davenport patent drawing is interesting (it's available as a free download from google patents), and since the firing pin tip shifts along the horizontal axis, you don't need to screw around changing the length of the link as some have previously recommended in past threads for converting H&A actions from RF to CF, and by not changing the length of the link, you don't change the timing of the breech block with the extractor.