The P320 Compact is the only striker-fired 9mm where the serialized part is a removable stainless steel chassis instead of the polymer frame. Pop two pins, lift the fire control unit out of the grip module, and drop it into a different size frame. Full-size grip for the nightstand, compact for the range, subcompact for summer carry. One serial number, multiple configurations. Most P320 owners never actually swap frames, but the option exists and no competitor matches it.

At 26.6 oz, the P320 Compact is heavier than most compact 9mms. The Glock G19 Gen5 does the same 15-round job at 23.63 oz. That 3 oz gap adds up during all-day carry in warm weather. The P320 compensates with SIGLITE tritium night sights and an optics-ready slide as standard equipment. Most competitors ship with plastic white-dot sights that buyers replace within the first month. The 6.5 lb trigger has a smooth take-up and a clean break, though community consensus is that it lacks the defined wall some shooters prefer.

Buy the P320 Compact if you want a modular platform with factory night sights and optic readiness that can grow into different roles. Skip it if concealed carry is the primary mission. At 26.6 oz with a 1.25-inch width, it is heavier than the HK VP9 (25.56 oz) and noticeably heavier than slimmer options built specifically for concealment. Sig's own P365 XL delivers 12 rounds at 20.7 oz in a 1.1-inch frame that disappears where the P320 Compact does not.