I saw that as well and they have two of the same on the list.
the Registered Mag is now called a S&W M27 and is a hand ejector model like all the other S&W models on the list like the J frame, K , L and N frames. Why single one out and not the others. But I digress why not lump it into the others and give another choice. Like a Luger that had most of the features we like, push button mag release, mag well in the grip, delayed blow back, single action, and multiple mechanical safeties, as an example.
My top ten would be.
10)The Broom handle- Delayed blow back and first sucessful automatic.
9) the 1911- Good design and one of the first of the leggo guns (lots of stuff to bolt on and customize)
the S&W M60- 1st stainless steel gun. Started the whole Stainless idea. Plus the whole hand ejector series.
7) the glock- use of molded plastics.
6) the Sig P220- Fist 45 auto that would shoot a staggard mag with out having to tune the gun to the load like the 1911
5) Colt 1903- pocket pistol Started the medium frame pocket pistols
4) walther PP- Double action Medium frame pocket pistols- basis for most now being used
3) Hi Standard Victory model- High end target 22's that lead to the Ruger Auto as well as the Browning 22 Autos being affordable.
2) S&W No.1 First bored through cartridge revolver.
1) And the colt Patterson- fist sucessfull single barreled revolver (Pepper box was earlier)
Other mentions: would have been. Remington 41 derrenger.
Colt Peacemaker (SAA)
S&W ejector guns -No. 1 to the No3 russian and Schofield as well as the original lemmon squeezer. And being a sucessfull double action.
The Adams revolver- Double action percussion out of England that was compitition for Colt, Remington, and S&W was the basis for the Colt lightning design.
The Colt lightning- Medium frame double action, similar to what most carried for almost 50 years.