Glock G19 Gen5 9mm vs Sig Sauer P320 Compact 9mm

Both pistols carry 15+1 of 9mm and are within 0.03" of each other in overall length. The meaningful differences are weight and feature set: the Sig P320 Compact is 2.97 oz heavier (26.6 oz vs 23.63 oz), the Glock's trigger breaks 1 lb lighter (5.5 lb vs 6.5 lb), and the P320 ships optic-ready while the standard Gen5 G19 does not. The P320 also has a modular fire control unit. The serialized FCU swaps between grip modules without a new firearms purchase.

Pick the Glock G19 Gen5 if:

• You want the largest pistol aftermarket on the market for holsters, sights, lights, and replacement parts
• You want a 1 lb lighter factory trigger pull (5.5 lb vs 6.5 lb) without aftermarket work
• You prefer 2.97 oz less weight on the belt for all-day carry

Pick the Sig Sauer P320 Compact if:

• You want a factory optic cut without paying for the MOS variant
• You want to swap grip modules (small/medium/large) without buying a new serialized frame — the FCU is the firearm
• You want the extra 2.97 oz of mass to absorb recoil for faster follow-ups

Both are striker-fired polymer-frame 9mms at the same 15+1 capacity, so capacity and dimensions are essentially tied. The choice comes down to trigger weight, the optic cut, and whether modular grips matter.