Glock G17 Gen5 9mm vs Glock G45 Gen5 9mm

These two share more than they differ: 17+1 of 9mm Luger, the same 5.47" height, the same 1.34" width, the same 5.8 lb listed trigger pull, three magazines each and the same $647 MSRP. Neither is optic-ready and both use fixed sights with a trigger safety. The Glock G17 Gen5 9mm runs a 4.49" barrel and 7.95" overall length; the Glock G45 Gen5 9mm shortens those to 4.02" and 7.44", reductions of 0.47" and 0.51". The shorter slide also cuts the sight radius from 6.5" to 6.02" and 0.49 oz of weight (24.48 oz vs 24.97 oz).

Pick the Glock G17 Gen5 if:

• You want the longer 6.5" sight radius rather than 6.02" on iron sights
• You want the full 4.49" barrel instead of 4.02"
• The gun lives in a duty or home-defense role where 0.51" of extra slide costs you nothing

Pick the Glock G45 Gen5 if:

• You want 0.51" less overall length (7.44" vs 7.95") for concealment or working around a vehicle
• You still want the full-size 5.47" grip and 17-round magazine, which the G45 keeps
• You want the marginally lighter gun at 24.48 oz against 24.97 oz

Same grip, same capacity, same listed trigger, same price and the same three magazines. The whole trade is 0.47" of barrel and 0.48" of sight radius against 0.51" less slide to conceal.