Glock G17 Gen5 9mm vs Sig Sauer P320 Full Size 9mm

These are direct full-size 9mm competitors at 17+1 capacity. The spec-table differences are weight, trigger pull, and the optic cut: the Sig P320 Full Size is 3.43 oz heavier (28.3 oz vs 24.87 oz), the Glock breaks 0.7 lb lighter at the trigger (5.8 lb vs 6.5 lb), and the P320 ships optic-ready while the standard Gen5 G17 does not. Length, height, capacity, and sight radius are within thresholds.

Pick the Glock G17 Gen5 if:

• You want the largest pistol aftermarket on the market for magazines, holsters, sights, and triggers
• You want 3.43 oz less weight on the belt
• You want a 0.7 lb lighter factory trigger without aftermarket work

Pick the Sig Sauer P320 Full Size if:

• You want a factory optic cut without paying for the MOS upgrade
• You want a serialized modular fire control unit that swaps between grip modules — the FCU is the firearm, not the frame
• You want the extra 3.43 oz of mass to soak up recoil during high round counts

Both pistols hold 17+1 of 9mm, share full-size dimensions, and run striker-fired polymer construction. The decision is the optic cut, FCU modularity, and how much aftermarket support matters.