I made a few tweaks to my G22C lately that have had a significant positive impact. Some of these were amazingly inexpensive and simple to install- not a single spring got away from me, unlike the first time I've done pretty much anything past field stripping on an AR.
Let's start with the expensive upgrade- Meprolight TRU-DOT night sights.
I realize that Meprolight doesn't recommend using a tritium front sight in the 22C since the sight is really close to the compensator ports but I'm going to risk it because the factory sight was fouling up after 80-100 target rounds. Meprolight features a thick white outline around the tritium lamps to keep the dots visible in bright light where traditional tritium sights become hard to see. About 200 rounds in so far so good- the front sight remains highly visible in various light conditions at local indoor ranges.
Changing from the Glock dot and bracket to the larger Meprolight 3-Dots wasn't as easy as I expected it to be. I shot low with them for a couple weeks and had to focus my point of aim so the center of the front dot was aligned with the top of the target. After a few hundred practice reps I made a discovery: when I relaxed my vision enough to really look through my gun at the target using both eyes the front dot just floated in my field of vision.
I could still see the rear sight but it was like the frame around my sight picture. Until that point all 3 dots from front and rear sights were what I was focused on at first. Suddenly aiming became simple- put the dot on the target and be sure to use both eyes.
Cost: $85 installed at my LGS (local gun store)
Extended mag release
Installation is a snap- this video shows how easy it is to change the release out — and it's a 5 minute job the first time you try. Unless you have freakish gigantic hands there is no good reason not to perform this upgrade if you shoot your Glock on a regular basis.
Cost: $5.17 from Amazon – up to $30 if you get fancy.
I mentioned it before but it's worth another plug for Tuff1 slip-on grips. I used to swear by Pachmyer but the Tuff1 is the perfect compliment to the slick polymer of a Gen3 or older Glock pistol. It gives the grip a little feedback from the cushion it provides- a huge difference as I scale back my strong hand grip to that 40% range of pressure.