Sig Sauer P320 Full Size 9mm vs Smith & Wesson M&P 9 M2.0 Full Size OR 9mm

Both pistols hold 17+1 of 9mm Luger, list the same 6.5" sight radius, ship optic-ready and come with two magazines. The Sig Sauer P320 Full Size 9mm carries the longer barrel at 4.7" against 4.25" and is 0.6" longer overall (8.0" vs 7.4"); the Smith & Wesson M&P 9 M2.0 Full Size OR 9mm is 0.2" taller (5.7" vs 5.5"), 0.09" narrower (1.16" vs 1.25") and 0.7 oz heavier (29.0 oz vs 28.3 oz). The wider gaps are trigger and price: the M&P lists a pull 2 lb lighter (4.5 lb vs 6.5 lb), while the P320 lists at $515 MSRP against $699 — a $184 difference.

Pick the Sig Sauer P320 Full Size if:

• You want the longer 4.7" barrel and 8.0" overall length instead of 4.25" and 7.4"
• The $515 MSRP against $699 matters to you, a $184 saving
• You want SIGLITE night sights front and rear out of the box rather than tall white-dot irons

Pick the Smith & Wesson M&P 9 M2.0 Full Size OR if:

• You want the lighter listed trigger pull, 4.5 lb against 6.5 lb
• You want four interchangeable palmswell inserts to size the grip; the P320 uses a fixed textured polymer grip
• A shorter, narrower gun suits you: 7.4" long and 1.16" wide against 8.0" and 1.25"

Capacity, sight radius and the factory optic cut are a wash at 17+1 and 6.5". The choice comes down to the 2 lb difference in listed trigger weight and grip fit against the P320's longer barrel and $184 lower MSRP.