Just joined the Forum today. I recently inherited a Remington Model 24 built in 1928. It is in excellent condition but I don't know when it was last fired. Called Remington and they recommended NOT to fire it because it was designed for less powerful ammo than we have today, and the metallurgy was also not as good as todays standards. Any recommendations? Anyone fired a Model 24 recently? I hate to have to just hang it on a wall.

Welcome to the forum, 1803marine.
Don't forget some pics, we like pics.
With that said, if your 24 is in shooting shape, it should be perfectly safe to shoot with standard velocity ammo.
High velocity can damage some older .22s.

Absolutely correct. Remington had nothing to gain and much to lose if they recommend shooting your gun and something happened. It was the early 1930's when high speed ammo came into vogue. A few companies manufacture standard velocity. I like CCI's standard velocity hollow points for small game hunting.

Older 22lr semi automatic rifles and pistols have recoil systems
made for standard velocity ammo. They can go metal to metal
and crack or mash parts with high velocity ammo. If gun is in
good shape most any brand of target ammo will work if you
can't find standard velocity. I know a fellow that had the bolt
knob on a mint Walther J-22 snap off on recoil stoke. He was
shooting CCI Stingers at the time.