Reminder to replace your recoil springs periodically.  Those things wear out sooner than you think and it can lead to cracked slides and breaking frames.  I broke a locking lug on my Beretta 92 a few years ago after about 10,000+ rounds on the recoil spring.  Before it broke I noticed the slide felt a bit sloppy on recoil.  Locking blocks need replacing periodically, but this one probably got premature wear.  Also check the replacement schedules for other springs and parts, especially on your defensive use guns.

Any other suggestions on parts that need to be frequently replaced?

For a few of my guns the recoil springs need replacing at:
Glock - 3,000 rounds for the single springs and 5,000 for the newer dual springs.
SIg P320 - 10,000 rounds
Beretta 92 - 5,000 rounds
1911 - around 2,000 rounds
AR15 Carbine Buffer Spring - 10 1/16th inches minimum.  I measured mine it's at 10 11/16th.  I got 10,000+ rounds through it, but I can't remember if I replaced it before.

For Glock, I was recommended change every 5k. I’d have to check but I’m over 5k on a couple, but I have springs on hand. 

For AR, I was recommended 10k. I have one over and another I sold at around 6k. There’s also the extractor spring.

I installed a Wilson Combat Shok Buff in my M9A3 when I shoot recreationally. Keeps the slide and frame cushioned when firing. Is it necessary? No. Does it make me feel better that I'll keep this thing healthy pass my lifetime. Yes.

The only gun I've replaced a recoil spring on so far in is on of my Glock 19 Gen 5. I ended up replacing it with a non-captured Wolff guide rod and spring and recoil spring adapter to take Gen 3 style single wound springs. Its nice to know when I need to change the spring again I can just throw away the spring and install another $6 spring on the guide rod. That and I can easily change it to my heavier 20lb or 22lb when I shoot the hotter stuff. Or my 13lb spring it when I reload powder puff rounds for friends and family members that are recoil shy.