Product Overview
- Full-size semi-automatic pistol chambered in .45 ACP with a 13+1 round capacity.
- Features the Glock Marksman Barrel (GMB) and MOS optics-ready slide with nDLC black finish.
- Includes 3 magazines and modular backstraps for grip customization.
- Must ship to a Federal Firearms License (FFL) holder.
Overview
The Glock 21 Gen 5 MOS is a full-size, striker-fired semi-automatic handgun chambered in .45 ACP. Built in the USA with a polymer frame and nDLC-finished slide, it measures 8.03" overall and weighs 29.81 oz unloaded. The MOS (Modular Optic System) cut on the slide allows mounting of compatible red dot sights using adapter plates.
Internal appointments include a dual recoil spring assembly, reversible enlarged magazine catch, and ambidextrous slide stop lever. The Gen 5 frame eliminates finger grooves and ships with interchangeable backstraps for grip adjustment.
Key Features
- Glock Marksman Barrel (GMB), 4.61" — precision-rifled barrel designed for consistent shot placement.
- MOS optics-ready slide accepts compatible red dot sights via adapter plates.
- nDLC black slide finish provides a corrosion-resistant, low-glare surface.
- Safe Action system — three passive, independently operating mechanical safeties that disengage sequentially on trigger pull.
- Modular backstrap system allows grip circumference adjustment without tools.
- Reversible enlarged magazine catch and ambidextrous slide stop lever accommodate both left- and right-handed use.
- Dual recoil spring assembly extends service life of the operating system.
What's In The Box
- Glock 21 Gen 5 MOS pistol
- 3 magazines (13-round)
- Interchangeable backstraps
- MOS adapter plates
FFL & Compliance
This firearm must ship to a Federal Firearms License (FFL) holder; we ship only to the FFL selected during checkout. Buyers are responsible for knowing and complying with all applicable local, state, and federal laws. Magnum Ballistics does not provide legal advice or determine purchaser eligibility.
