Sig Sauer P320 Compact 9mm vs Sig Sauer P365 XL 9mm

Both are Sig modular striker-fired pistols at the same compact size class, but on different fire control units. The P320 Compact carries three more rounds (15+1 vs 12+1) and runs a 1.0" longer sight radius, but pays 5.9 oz in weight (26.6 oz vs 20.7 oz) and 1.0 lb in trigger pull (6.5 lb vs 5.5 lb). The P320's FCU is duty-sized; the P365 XL's is the smallest Sig serializes. Grip modules from one will not interchange with the other.

Pick the Sig Sauer P320 Compact if:

• You want 15+1 capacity — three more rounds than the P365 XL
• You want the duty-grade P320 FCU that scales up to full-size and X-TEN grip modules
• You want a 1.0" longer sight radius (6.6" vs 5.6") for tighter groups

Pick the Sig Sauer P365 XL if:

• You want 5.9 oz less weight on the belt for all-day carry
• You want a 1 lb lighter factory trigger pull (5.5 lb vs 6.5 lb)
• You want a slim 1.1" frame for inside-the-waistband concealment

Both are modular FCU platforms with factory optic cuts, but they don't share parts. Choosing one commits you to that family of grip modules.