Glock G21 V MOS 45 ACP 4 61 IN Optics Ready 3X10RD

About this product

This listing is a Glock 21 Gen5 MOS in .45 ACP — the "V" in some listings refers to Glock's international generation numbering, where Roman numeral V simply means Gen5 — with a 4.61-inch barrel and an optics-ready slide. Glock doesn't publish a fixed consumer MSRP, so the $620 price here comes from current-market listings specifically citing a "Glock 21 V MOS" configuration matching this description.

What changed with the Gen5 update to the G21?

Glock's Gen5 refresh removed the finger grooves from the frame that earlier generations included, added front slide serrations for a better grip during manipulation, and incorporated the Modular Optic System for factory optics-ready mounting without aftermarket plates or slide milling. The Gen5 also dropped the ambidextrous magazine release lever some earlier Glock models used, in favor of a more conventional design most shooters found easier to use without accidental drops.

Why does .45 ACP still have a following in a 9mm-dominated market?

.45 ACP remains popular with shooters who prioritize a larger-diameter bullet and a long track record of terminal performance in a duty and defensive round, even though modern 9mm defensive ammunition has closed much of the performance gap that used to favor .45 in ballistics testing. For shooters who've already standardized on .45 ACP across their collection, or who simply prefer the cartridge's recoil character, the G21 remains one of the most reliable, widely supported polymer-framed options in the caliber.

Why does this listing ship with three 10-round magazines instead of Glock's standard 13-round units?

Glock's standard G21 Gen5 configuration ships with 13-round magazines, but this specific listing includes three 10-round magazines instead — a configuration built for buyers in states with magazine capacity limits, including California. That's a meaningful detail: it suggests this listing was set up with California-facing buyers in mind, though the included magazines alone don't confirm the pistol itself is on the state's approved handgun roster.

What does "optics-ready" mean for this specific pistol?

The MOS slide cut lets you mount a red-dot optic using Glock's included adapter plates matched to your optic's footprint, without sending the slide out for aftermarket milling. Combined with the .45 ACP's larger frame and the pistol's roughly 26-ounce unloaded weight, it's a full-size home-defense and range pistol rather than a concealed-carry-focused build, though the MOS cut and optic option are increasingly common even on home-defense guns for faster target acquisition.

What should California buyers still verify before ordering?

Even with 10-round magazines included, confirm with your FFL that this exact G21 Gen5 MOS configuration currently appears on California's approved handgun roster before completing your order — magazine capacity and roster approval are two separate requirements, and satisfying one doesn't automatically satisfy the other.

As a firearm, this pistol cannot ship to a home address. It transfers through your chosen licensed FFL dealer, where you'll complete the required background check and any state waiting period.

Is the G21 a good choice for a first .45 ACP pistol?

Yes, for shooters who already have some experience with a 9mm Glock and want to step up to a larger caliber without changing manufacturers or manual of arms. The controls, takedown procedure, and general handling are nearly identical to Glock's 9mm models, so the learning curve is mostly about adapting to more recoil and a larger grip circumference rather than learning an entirely new pistol from scratch.