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Upgrade your Gen 3 Glock 20 or Glock 20 SF to be the perfect woods companion with the GY6 long slide with serrations on top of the slide, not only does it look great but eliminate glare.
The 42 RC 17-4 stainless steel slide comes cut for your choice of RMR or Holosun EPS footprint red dots, optics mount directly to the slide low enough in most cases to not require high co-witness sights, no adapter plate required (Must use screws provided with slide).
Add your preferred sights, barrel, slide internals, and recommended 22-24lb recoil spring assembly. Upgrade your firepower in the woods!