By floating barrel, I mean...look at a Glock when you reload it...the loading end of the barrel dips down as the bullet is loaded, and then back up as the slide is returned.
If you press down on the bullet side of the barrel of a Glock while the slide is closed, you will feel a certain amount of "give" and freeplay within the assembly. I am speaking in very small fraction of a mm terms here...
But if you then grab a PX4 and press down on the bulletside of the barrel, it does not move at all. There is no freeplay at all. The barrel has a tab on it which locks it to the firing pin area (whatever the technical term is). This tab makes the barrel fit more solidly with respect to the rest of the gun and in turn, stiffens things up a bit.
By eliminating this tiny amount of freeplay, the PX4 will inherently be more accurate than the Glock.
So I guess I am asking if anyone else makes a locking system that prevents unwanted freeplay on the inside end of the barrel aside from Beretta.
I would invite you to look at more Glocks samples than the one(s) U looked at so far. Mine has zero play in the barrel to slide fit when the slide is closed. All of my guns have this "tilt" barrel design (its a tilt barrel, not a floating barrel). They are all rock solid. This is the typical design of semi-auto handguns. Even 1911s tilt when U pull the slide back. They just have a bushing at the end of the barrel. Are U saying that the PX4 is more accurate than a 1911.
I honestly think you have come to the wrong conclusion, or someone fed U some bad info. Or, both.
When the slide is open, there is some play in the barrel - there has to be, in order for the barrel to change angles and fit thru the end of the slide when the slide is all the way back.
But when the slide is closed, there should be no play in the slide to barrel fit.
Theoritically, the PX4 design should be more accurate, because of what U are saying. But it is no more accurate than any of the other service type of semi-autos (guns a police or military would use). I had a Courgar in the 1990s - the first Beretta to use this rotary design. It was no more accurate than any other 9mm of similiar size. And, if U read reviews of the gun w/ bullet group testing, it is no more accurate than other semi-autos that use the "tilt" barrel system.
Beretta didn't actually come up with the rotating design. I read somewhere a long time ago that it was used years ago by another company originally. But admittedly, they are the only ones using it now.
Is the PX4 a good gon? Yes. Not my fav, but yes. Is it more accurate than any other semi-auto? No.
Now, U will find some brands of semi-autos with the tilt barrel to be more accurate than others. HKs supposedly are more accurate than Glocks. It also costs more. I find my P99 to be as accurate as an expensive 1911. All of these have tilt barrels.
If U are looking for an alternative to the PX4 but still keeping with the rotating barrel - U will only find 1 other gun 1 that. The Beretta Cougar. Its an all metal version of the PX4, but with a shorter barrel. And now, U can but them made by Stoeger, because Beretta transferred the equipment to Stoeger. Stoeger is owned by Beretta, however. SO, it is essentially the same gun, but w/o the fit and finish of the higher costing Beretta version that has now been discontinued. But, even the Cougar has the safety on the slide. That's how Beretta likes to make their guns. THESE 2 guns are the ONLY rotating barrel system like that.