The first M10 that I bought was impulse purchase. Late 60s we
had a new Game Warden, he had bought 6" m10 and holster less
than a week before he came back to trade it on a 4". I happen to
be in the Gunshop when he came in for the trade. The owner
gave me a killer deal on the 6". By 70s most LEOs in our area
had 4" m19s. The old school guys with 5" & 6" guns were fading
away. 4"ers much easier to get in and out of vehicles with.