I have to speak up in support of billt460's observations. The gun industry of today is nothing like it was in the 1970s. The markets have changed, the products changed, and to survive, you have to cover all the bases.
Ruger has an advantage over everyone else in that Pine Tree Castings accounts for the vast majority of the overall revenue generated for the company - which allows them to market as many oddball configurations as you can come up with.
Ruger along with S&W are two examples of market spread over a wide field. If you want rifles, shotguns, rimfires, pistols, revolvers, Ruger has something for everyone. Single action and double action wheelguns from .22LR all the way up to .480. Auto pistols from the .22 semi autos through all sorts of center fires (and I don't include the Mark III). Want rifles? Bolt action - what caliber ? You name it, they probably have it. They even jumped into the AR market to keep up with everyone else. Smith & Wesson still leads the pack with snub .38 Special CCW wheelguns, and one of the better service autos on the block (Sorry, I'm still carrying my Glock). Their AR clone is on par with Ruger, or any of the major producers.
Colt - (cough) . . . the once great company had some of the best handguns on the market. Revolvers for all levels from the Python to the Trooper, the **** Special to the Cobra. The Colt Woodsman is still a prized find. But they gambled on US Govt contracts only, ditched the double action revolvers, tossed aside most of the civilian market except for the M1911A1 still built on 1915 machinery, and the AR15. Then along came F.N. and beat them at their own game. From what I gather, Colt no longer even owns the famous Blue Dome of Hartford that was once the east armory.
Marlin - they made, essentially for all intents and purposes, one gun - the lever action rifle. Their bolt actions were so-so. But the name Marlin and Lever Action were somewhat synonymous. But not everyone wants, or likes, the 336 --- so they go elsewhere.
Harrington & Richardson was out of the rifle game in the 1960s. They had a heyday making M1 Garands in the 1950s, and the M14 in the 1960s. They made a cheap double action revolver that was, well . . . cheap. They settled in making single shot shotguns, and again like Marlin, not everyone wants single shot shotguns.
I don't even want to think about what's come of Winchester. They had nothing of interest at the NRA meeting in Atlanta this past April.
Mossberg is an anomaly with their bread and butter being the M500/590 shotguns. At one time, Mossberg was not even a contender against the Remington shotguns - but that changed, and now the 870 and the 590 run neck and neck. Mossberg brings out the 'Shockwave' and Remington has to follow up. It's a market share grab. Yes, they each have specific features that are pluses and minuses, but essentially, they're both solid reliable platforms. (You get one of each so as you flip flop on which is your favorite, you already have one)
Some names lost are no loss - Lorcin, Bryco, and RG as examples. But for any of the major gun companies to go under is not just an injury to the marketplace, but potentially harmful nationally. Look at WW-II at how many companies made M1 Garands and M1 Carbines (including auto makers). Remington made M1911A1 pistols and M1903A3 and A4 bolt action rifles, all the go up against another country with the best armaments industry of its day. By the time the 1960s rolled around, you had General Motors back making M16 rifles for Vietnam.
Yes, we all take turns bashing certain gun makers, I do it myself. I still haven't fully forgiven Bill Ruger for selling out to the Clintonistas in 1994, but that doesn't mean I haven't bought Ruger guns since he passed away. (compared with not having to do with anything Smith & Wesson with their stupid sideplate locks)
Billt460 is correct that any time a company falls from grace, it's not going to be the gun, but those running the company. Yes, labor costs are through the roof, but American can still build some of the best firearms in the world. Are they going to be built like in the 1960s - no, but neither are our automobiles. Personally, I find a CNC made gun that can take drop in parts more attractive than one that has to be entirely hand fitted (can you spell 'Python'). Does a Ruger GP100 look and feel as elegant as a Colt Python? Certainly not, but that GP100 will be on the range firing away with magnum loads long after the Python goes back to Colt for a tune-up.