So I have an older model of the gen 2.5/3 34 that has the half moon cut on the frame. However looking inside the slide I noticed a difference of the slide to most of the standard gen 3 slide. Why did glock make this type of part inside the slide and is everyone that owns a 34 gen 3 does your slide inside has these type of grooves or blocks. I'm not sure what's it call so I'm just saying or calling it that for now. Hear is some photos of it.
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