Glock G40 Gen4 MOS 10mm vs Sig Sauer P320 XTEN 10mm

Both are optic-ready full-size 10mm Autos holding 15 rounds, and their MSRPs are $10.01 apart ($840.00 vs $829.99). The Glock G40 Gen4 MOS 10mm is the long-slide option: a 1.02" longer barrel (6.02" vs 5.0"), a 1.51" longer sight radius (8.31" vs 6.8"), 0.99" more overall length (9.49" vs 8.5"), an adjustable white-outline rear sight and three magazines in the box. The Sig Sauer P320 XTEN 10mm is 2.45 oz lighter (33.0 oz vs 35.45 oz), 0.99" shorter, lists a 1.1 lb lighter trigger (4.3 lb vs 5.4 lb), and carries XRAY3 day/night sights front and rear with two magazines.

Pick the Glock G40 Gen4 MOS if:

• You want the longest barrel and sight radius here: 6.02" and 8.31"
• An adjustable rear sight and three magazines come standard
• The 9.49" overall length suits a chest or field holster rather than concealment

Pick the Sig Sauer P320 XTEN if:

• You want the shorter, lighter 10mm: 8.5" overall and 33.0 oz vs 9.49" and 35.45 oz
• The listed trigger is 1.1 lb lighter (4.3 lb vs 5.4 lb)
• You want XRAY3 day/night sights and the modular fire-control unit

At nearly the same MSRP and identical capacity, the question is barrel length. The G40 trades 2.45 oz and an extra inch of gun for 1.02" more barrel and 1.51" more sight radius; the XTEN is the handier one with the lighter listed trigger.