Glock G20 Gen5 MOS 10mm vs Glock G40 Gen4 MOS 10mm

Both hold 15+1 of 10mm Auto, both are optic-ready and both ship with three magazines and interchangeable backstraps. The Glock G40 Gen4 MOS 10mm is the longslide: a 6.02" barrel against the Glock G20 Gen5 MOS 10mm 4.61", 1.41" more, which stretches overall length by 1.42" (9.49" vs 8.07") and sight radius by 1.38" (8.31" vs 6.93"). It also adds 7.05 oz, 35.45 oz against 28.4 oz. Listed trigger pull is 5.4 lb on the G40 and 5.8 lb on the G20. The G40 rear sight is adjustable where the G20 uses a fixed white outline. MSRP is $840 and $650, a $190 gap.

Pick the Glock G20 Gen5 MOS if:

• You want the same 15+1 and the same optic cut without carrying 7.05 oz more
• You need it to fit ordinary belt holsters at 8.07" rather than 9.49"
• The $190 MSRP gap matters, $650 against $840

Pick the Glock G40 Gen4 MOS if:

• You want the 6.02" barrel, 1.41" longer than the G20's
• You want the 8.31" sight radius for deliberate shots in the field
• You want an adjustable rear sight and a listed trigger pull 0.4 lb lighter, 5.4 lb against 5.8 lb

Capacity, width and the optic cut are the same on both, so this is barrel length weighed against carry weight. The G40 buys 1.41" of barrel and 1.38" of sight radius for 7.05 oz, 1.42" of length and $190.