I hope a long digression form Logan's Run is okay for a sec...
There are people out there who know more behind the scenes info about the original BSG gun props than I do, but I've owned two and researched the heck out of the things for years, so here's what I can tell you: for the original series, the hero laser pistol props were made with fiberglass shell bodies with milled down clear acrylic shower heads with black paint detailing for front barrels. Aircraft strobe lights were inside these clear barrels, and from vintage bts photos, it looks like at least somee of the props had batteries (maybe rechargeable?) cast inside the fiberglass bodies and a socket for a cord in the bottom of the grip. Some early props had d-rings/lanyard rings on the bottom of the grip, too. Some props had thin, sleek trigger guards, while others (later ones?) had thicker reinforced trigger guards. The initial master prop that the hero bodies were cast from was carved/formed out of clay, and then tons of kit-bashed plastic model kit parts were attached for detailing. When you see an original up close, it really does look like the base body under the detail was quickly molded out of clay--tool marks and rough areas everywhere!
There were midgrade models made as well--the one I'm most familiar with is a hollow fiberglass casting, probably cast from one of the early hero working pistols. I'm assuming rubber versions were made, but the only rubber ones I've seen (including the one I used to own) looked like Galactica 1980 versions (see below) and were the all-white kind.
Later, for Galactica 1980, the best I can tell (from the ones that have come up for auction) is that they made a new mold from a midgrade original series gun with one of the thicker trigger guards. Even the working hero props for Galactica 1980 were just fiberglass casts hollowed out with a tiny bulb in a hole cut into the front of the barrel which was activated by a small push-button trigger. Coincidentally, lots of the Galactica props used the same little red or black-capped Alcoswitch push-button switch used on the TV Logan's Run guns! At least two black hero Galactica 1980 guns and one white one have been auctioned off in recent years.
As for accurate replicas, it depends. Coyle's is cast from an original or from a low-gen casting of an original, with only some slight modifications for his electronics and to replicate missing details, making it pretty screen/set accurate, while the BSG.org one is an idealized recreation (none of the flaws,tool marks, irregularities of the screen-used ones) but it was made using casts of the same model kit parts used in the screen-used guns. It's very clean and looks pretty good, but for some reason (and this has always bugged me), they cut out a little rectangular area under the barrel and left an open space.
Hope all this was informative--I would love anyone else with info on the originals to chime in!