Back in the day, we had monster-sized stuff like the Eo-Thing.
I later switched to the smaller Bushnell Holosight. It’s an improvement in size & weight, but is still kind of bulky.
I tried a Burris TRS-25 on the L5 in .357. It didn’t make it through two magazines before failing. It cracked the rear lens. It’s an old one, before they offered a lifetime warranty. The sight still works, but now lives on a .22 rifle.
The L5 now wears a Fastfire III, which has held up well.