The Sig Sauer P320 Full Size is a full-size striker-fired .45 ACP built for duty use and home defense. Sig no longer makes the P320 in .45 ACP, so it's a used buy. It came with SIGLITE night sights fitted and two 10-round steel magazines, so a complete example needs nothing for low-light use.

The grip is a separate polymer module, so grip size changes by swapping that part instead of buying a different pistol, and the slide is stainless steel under Nitron. The trigger is striker-fired at 6.5 lb with no manual safety, working through a striker safety and a disconnect safety. The barrel is 4.7 inches and the pistol is 1.3 inches across at 29.5 oz. The slide has no optic cut, so a dot means milling or a different slide.

If you're cross-shopping, the Smith & Wesson M&P 45 M2.0 holds the same ten rounds, 0.3 oz heavier on a 4.6-inch barrel, with four palmswell inserts instead of a grip module and plain two-dot sights instead of tritium, and Smith & Wesson has retired it too. The Glock G21 Gen5 MOS carries thirteen rounds at 29.1 oz with a factory optic cut and three magazines, so it wins on round count and on mounting a dot.