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Glock 17 Slide Buyer's Guide Which generation slide do I need? Match the slide to your frame generation. Gen 3 slides fit Gen 3 frames (and Polymer80 PF940v2). Gen 4 slides fit Gen 4 frames. Gen 5 slides fit Gen 5 frames. Cross-generation fitment is not possible due to differences in recoil spring geometry. What's the difference between OEM and aftermarket slides? OEM slides are factory-original parts. Aftermarket slides are precision-machined by third parties — we only carry options that hold factory tolerances and fit without modification. Do I need an MOS slide to mount a red dot? Yes — or a slide with a direct optic cut. Standard iron-sights slides cannot accept red dots without gunsmith milling. Do you sell stripped and complete slides? Both. Stripped slides are the slide body only. Complete assemblies include barrel, recoil spring, and internals — ready to install and shoot.