Glock G20 Gen5 MOS 10mm
Model: PA205S203MOS
Glock G20 Gen5 MOS 10mm
Model: PA205S203MOS
Full Specifications
About This Firearm
The Glock G20 Gen5 MOS is the standard-bearer for modern polymer 10mm handguns. At 28.4 oz with a 4.61" barrel, it is the lightest full-size 10mm in the category. That low weight is a double-edged sword: owners consistently report sharper felt recoil with full-power loads compared to the heavier Sig P320 XTEN (33 oz) or steel-framed 1911s in the 35-44 oz range. But for anyone who plans to carry a 10mm on a belt all day in bear country, those 4-7 oz matter.
The Gen5 update brought the ambidextrous slide stop, flared magwell, and Marksman barrel that Glock 9mm shooters already know. Capacity is 15+1, matching the XTEN and putting it 7 rounds ahead of every 1911-pattern 10mm. The MOS system accepts optic plates without aftermarket milling. Three magazines ship in the box. The 5.9 lb trigger is heavier than the S&W M&P M2.0's 4.3 lb pull, but Glock triggers have a massive aftermarket for drop-in replacements.
The G20 has been in production since 1991, making it the longest-running polymer 10mm on the market. The Gen5 MOS version is the current evolution, but the platform's 34-year track record with hot loads is what sets it apart from newer competitors. More holsters, aftermarket barrels, and conversion kits exist for the G20 than any other 10mm handgun.
Best For
Strengths & Limitations
- The largest aftermarket of any 10mm handgun. More holsters, barrels, triggers, and conversion kits exist for the G20 than all other 10mm models combined.
- Three magazines included. The Glock G20 and G40 share magazines, so spare mags work across both guns.
- At 28.4 oz, it is the lightest full-size 10mm. Owners report noticeably more felt recoil with full-power loads than the 33 oz Sig XTEN or 35+ oz 1911s.
- The 5.9 lb trigger is the heaviest stock pull among polymer 10mms. The S&W M&P M2.0 pulls at 4.3 lbs and the Sig XTEN at 4.3 lbs.
Category Rankings
How the Glock G20 Gen5 MOS 10mm ranks among full-size 10mm Auto handguns.
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Alternatives to Consider
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Smith & Wesson M&P M2.0 10mm
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Springfield Armory XD-M Elite 10mm
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Sig Sauer P320 XTEN 10mm
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EAA Witness Steel 10mm
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Glock G40 Gen4 MOS 10mm
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Frequently Asked Questions
Do Glock G20 and G40 magazines interchange?
Yes. The G20 and G40 use identical 15-round 10mm magazines. The G29 subcompact also accepts G20/G40 magazines, though they extend below the grip. Aftermarket options from ETS and Magpul (GL9 with 10mm adapter) also exist, though Glock factory mags are the community standard for reliability with hot loads.
Can the Glock G20 handle full-power 10mm loads?
The G20 has been in production since 1991 and has a long track record with hot loads from Underwood, Buffalo Bore, and DoubleTap. The Gen5 recoil spring is tuned for full-power ammunition. Some owners run an aftermarket 22-lb recoil spring for the hottest loads, but stock is rated for standard-pressure 10mm and most commercial hot loads.
Is the G20 Gen5 MOS barrel compatible with G20 Gen4 holsters?
Most G20 Gen4 holsters fit the Gen5, but MOS-equipped slides are slightly taller due to the optic plate. Holsters with tight retention near the ejection port may need adjustment. Kydex holster makers like Safariland and Alien Gear make Gen5 MOS-specific models. Check before ordering.