Performance parts for Glock Generations 1 - 3.
Improvements and trade-offs between trigger weight, crispness and reliability with hard primers.
Matching the recoil spring setup to your ammunition can reduce felt recoil to improve accuracy and speed.
Changing the controls or grip texture can tailor the pistol to your hand size, grip and intended use for the pistol.
Flared magazine openings to increase reloading speed.
Colour code your magazines to separate training from carry mags, or increase capacity.