Okay no this will seperate the stone age from the modern age. What was your first duty weapon? Mine was a Smith mod 66. We had dump pouches to begin with and we really thought it was a leap forward, first foot on the moon,  when we got speed loaders. 

Not really a fair judge in my case of era. While my FIRST duty weapon was a semi-auto it was a Colt 1911 .45 issued by Uncle Sam. That was the choice for Army MP's at the time. However, my first duty weapon as a civilian cop was in fact a wheel gun, Colt Trooper Mk V .357.

SMITH &WESSON 686 W/TWO SPEED LOADERS IN 1990.

Brand new smith 686 and i still have it locked up at home in a box.

Colt 357 King Cobra

H & K USP 40

S&W Model 66 ( in 1979) with 12 rounds in a loop  loader, was a real pain at the academy, got a new Sheriff,  they got us speed loaders. Finally in the early 90's we went to the Sig 229 in .357.

Started off with a personally owned Glock 22 as a reserve in 1997.  Got issued a Sig P220 when hired fulltime, about 6 mos later went back to my Glock.

Kimber Tactical Custom II .45 acp

S&W Mod. 19, 4inch barrel, .357mag.  Bought it for duty when I was hired as a Special Officer at age19 (Special Officers had to purchase their own duty weapons at that time) and I still have the same gun in my safe today. (When I bought the gun in 1973 you could legally purchase a handgun from an individual at age 18 in New Jersey, but had to be 21 to purchase from a dealer, so I had to have one of the other, older Officers purchase the new gun for me from the dealer and I then bought it from him, still in the box and brand new).

When I got hired as a regular LEO in 1977 my first issued duty weapon was a Colt "Metropolitan" with issue .38cal. ammo.  The "Metropolitan" was the predecessor of the Colt "Trooper" series and was about 20+ years old when I was issued the gun.  Wish that I had that "Museaum Piece" in my collection today!

Military S&W model 15 with dump pouches, the PD S&W model 19 after I graudated the academy got upgraded to a S&W model 469

In 1964, S&W .38 with 4" barrel. Dump pouches were issued. In 1965 I purchased a S&W Model 19, 6" barrel. I still have both.

My first duty weapon was a .357 Revolver, with a 'big' bang. I have a Glock .40  (23C) now, and I love it.

I am kind of surprised I didn't see more postings regarding my first LEO firearm.

Colt Python 'wheel gun', 6 inch barrel, all stainless. I still have it. No, you can't have it.

I purchased a Ruger GP100 .357 to go through the academy with, but it got stolen in a burglary right before the academy.  I purchased a S&W 686, so that was actually my first duty weapon.  This was in 95 and the state parks allowed us to carry 9mm (no faith in that), .38 special or .357.  .357 was a no brainer.