Glock G21 Gen5 MOS .45 ACP, Gray Frame, Ported Slide & Barrel, SLR Magwell, 6x 13-Round Magazines
This full-size Glock G21 Gen5 MOS stands out with a gray polymer frame, nDLC-finished slide, and notable custom work that includes a ported slide and ported Glock Marksman Barrel. It features ambidextrous controls, a reversible magazine release, and an accessory rail. The pistol comes with an installed SLR-branded magazine-well funnel and six 13-round factory magazines, some fitted with SLR extended basepads.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This pistol shows mild handling wear. The MOS slide is missing the factory cover plate. Overall, it presents in great shape.
What’s Included
- Six Glock factory 13-round .45 Auto magazines (some fitted with SLR-branded extended basepads)
- SLR-marked magazine-well funnel (installed)
The Gen5 MOS slide includes front and rear cocking serrations, a beveled muzzle, and top slide windows that complement the custom porting. The ported Glock Marksman Barrel and slide are non-factory, confirming this is not a factory "C" Gen5 variant.
Controls are Gen5-configured with ambidextrous slide stop levers and a reversible magazine release. The gray polymer frame integrates a flared magwell area, further enhanced by the installed SLR magazine-well funnel. An accessory rail on the dust cover supports compatible lights or accessories.
The slide is MOS-cut for mounting optics. No optic is included, and the factory MOS cover plate is not present. Sights are fixed.
The pistol retains Glock’s nDLC slide finish and the updated Glock Marksman Barrel. Capacity is 13+1 in .45 ACP, and this example includes six factory double-stack magazines, with some wearing SLR-branded extended basepads.
The frame is U.S.-marked "MADE IN USA - GLOCK, INC., SMYRNA, GA." and the build reflects Gen5 updates throughout. This configuration pairs the proven G21 platform with targeted customizations focused on handling and recoil management.