Glock G19 Gen5 MOS 9mm vs Glock G45 Gen5 MOS 9mm

Same slide, longer grip. The Glock G19 Gen5 MOS 9mm and the Glock G45 Gen5 MOS 9mm share a 4.02" barrel, a 6.18" sight radius, 1.34" of width, a 5.8 lb trigger pull, an optic-ready slide and three magazines. The G45 puts that slide on the full-size frame: 17+1 instead of 15+1, 0.43" more height (5.47" vs 5.04"), 0.16" more overall length (7.44" vs 7.28") and 0.71 oz more weight (24.52 oz vs 23.81 oz). MSRP is $636 for the G19 MOS and $745 for the G45 MOS, a $109 difference.

Pick the Glock G19 Gen5 MOS if:

• You carry concealed and grip height is what prints: 5.04" vs 5.47"
• You want the lighter gun at 23.81 oz
• The $109 MSRP gap matters, $636 against $745

Pick the Glock G45 Gen5 MOS if:

• You want 17+1 instead of 15+1
• You want the full-length grip so a larger hand gets all four fingers on the frame
• The gun lives in a duty or range holster where 0.43" of extra grip costs you nothing

Barrel, sight radius, trigger pull and width are identical, so the two behave the same from the trigger forward. It comes down to two more rounds and a full grip against 0.43" less height to hide.