I can remember two ranges of plastic, life-size gun kits that appeared in the fifties and (I think) early sixties. The bigger range was from Pyro. I have no idea how many kits were in it, but the ones I remember include a couple of eighteenth-century pistols, a Colt .44, a Winchester carbine, and an "African rifle." The latter was enormous (maybe the longest plastic kit prior to the Revell Gato-class sub?), and adorned with all sorts of "gold" ornamentation. Somebody brought one to one of our IPMS chapter meetings, and it created quite a sensation.
As I recall, the quality of those kits varied quite a bit - probably due to their having been designed and released over a fairly long period. I seem to remember being disappointed with one of the eighteenth-century flintlocks, which had only a few pieces and was pretty crude. On the other hand, I remember buying a Colt pistol that looked like the molds had been made directly from the real thing. It had a super-realistic metal texture and lots of moving parts - including the cylinder and the hinged rod that ejected the empty cartridges. I think there even was a linkage, with metal springs, inside the grip that connected the trigger with the hammer, so the builder could cock the hammer, pull the trigger, and hear a distinctly plastic "click" when the hammer hit the cartridge.
I think the Pyro line was quite a bit bigger than the few I've mentioned. I'm pretty sure those "new" Lindberg kits are reissues of the Pyro ones - which also appeared for a while under the Lifelike label.
Revell also issued (briefly) a smaller range of life-size gun kits. Those are listed in the appendix to Dr. Thomas Graham's fine book, Remembering Revell Model Kits. They were a "Pepperbox," an eighteenth-century dueling pistol, a Derringer, a Colt .45, a "Pirate Blunderbuss," and a "Miquelet Arabian." According to Dr. Graham, they appeared in the Revell catalog in 1955 and 1956, and stayed there till 1957. Apparently they weren't particularly popular then or now; Dr. Graham gives their current prices on the collector's market as only $25-$35.
I can't recall having bought any of the Revell gun kits. I don't imagine any of them were identical to the Pyro ones, but I can't say that for certain.
A comprehensive list of all the kits ever produced by Pyro would be extremely interesting. That long-gone company really was a major player in the plastic kit industry for a long time.