I love 1911s and trusted them with my life for 40 years or so.
... [I also really like the P35, which is a highly modified Browning design
concept]
However, none of the pistols that I mentioned are copies of J.M.Browning designs.
The J.M.Browning 1911 design uses a "chain" link to allow and limit barrel movement and some intricate mortise and tenon [land & groove] machine work on the barrel hood and the [inside / underside] slide surface to lock up the barrel to the slide during firing.
The P35:
retains the J.M.Browning 1911 design intricate mortise and tenon [land & groove] machine work on the barrel hood and the [inside / underside] slide surface to lock up the barrel to the slide during firing;
but,
dispenses with the "chain" link and uses a barrel [underlug] cam block which travels in a frame slot to limit barrel movement.
This concept, along with much / most of the P35 design was roughed out by J.M.Browning who had begun working with Fabrique Nationale (FN); and was perfected by his understudy at FN, Diedudonné J. Saive, after his mentor’s death.
Completely on his own, Saive developed the double column 13-round magazine, etc..
In 1941 Saive and some of his colleagues escaped from Belgium to Britain where he continued to work on a revolutionary new rifle which after a few variants and many years, eventually became the Fusil Automatique Léger, ...
the "FN FAL".
The Beretta M9 uses the [{Beretta 92 series} Walther P38 developed] "artillery lug" drop block lock system.
The Beretta PX4 uses a rotating bolt built into the barrel hood, a system derived from the Beretta Cougar which was the first commercially successful pistol of this design; ...
although it was first popularized by the old Colt "All American" {copied from an earlier obscure European design}
and is also now used in the STI GP6.
The SIGS, the S&W-M&Ps, and the XDs:
borrow the barrel [underlug] cam block which travels in a frame slot to limit barrel movement [from the P35];
and add the [SIG developed] enlarged barrel hood lock up to a precision cut rectangular ejection port in the slide.
Many other modern pistols [EAA, FN, Glock, H&K, Kahr, Ruger, Taurus, Walther, etc.] now use this system.
