Pistol: .45 1911A1, always dependable, felt like crying the day we took on the Beretta. Never got enough ammo to shoot-- only for requal. Wore the SS badge once, expert the rest of the time. Only qual'ed once with the Beretta, just never liked it.
Rifle: M16A1 was the only one I fired. By the time the M16A2 came along, I was not going to the rifle range anymore. A pity-- the heavier barrel made the A2 a much better weapon. The sights were easier to adjust, too.
106 mm recoiless rifle: great 1950s era weapon we used until around 1977-78, but was way obsolete against armor. Fun to shoot both the main gun and the .50 cal spotting rifle. Replaced by the Dragon, a POS.
M79 grenade launcher: a few of these left in the armory in the mid-late 1970s. Great for marking targets for air. Fun to shoot-- more fun than the M203 that replaced it.
Bad weapons' memories-- humping the 81 mm mortar bipod, the tube, or the M60 machine gun on hikes!
Best weapons' memory-- going to the rifle range for annual requal as a unit. Everyone competed against one another. Nobody wanted to be low shooter when you changed stages, because you would have to carry the scoreboard back. Working the butts was part of the camraderie, too. Shooting ten fives from the 500 yard line. Shooting a "possible" in rapid fire.
I'd do it again in a heartbeat!