Glock G22 Gen5 .40 S&W vs Sig Sauer P320 .40 S&W

These full-size .40 S&Ws are nearly identical on paper. Capacity is within 1 round (15 vs 14), length within 0.05", height within 0.01", weight within 1.07 oz. The clearest spec-table difference is trigger pull: the Glock G22 Gen5 breaks 0.6 lb lighter (5.9 lb vs 6.5 lb). Beyond that, the meaningful choice is the platform itself — Glock's larger aftermarket against the P320's serialized modular FCU that swaps between grip modules and other calibers.

Pick the Glock G22 Gen5 if:

• You want the largest pistol aftermarket for parts, magazines, and holsters
• You want a 0.6 lb lighter factory trigger pull without aftermarket work
• You want one more round of .40 S&W in the magazine (15+1 vs 14+1)

Pick the Sig Sauer P320 .40 S&W if:

• You want the serialized modular FCU that swaps into 9mm and .45 ACP grip modules
• You prefer the P320's beavertail and grip geometry over Glock's blockier frame

Dimensions, weight, and capacity are essentially tied. The decision is aftermarket size or FCU modularity.