Glock G40 Gen4 MOS 10mm Auto Long Slide, 6.02 in Barrel, Fiber-Optic Front Sight, Made in Austria
The Glock G40 Gen4 MOS is a long-slide 10mm Auto built with a 6.02 in barrel and factory MOS optics interface. This Austrian-made pistol combines the Gen4 RTF frame with an enlarged magazine release, Safe Action system, and a factory-rated 15+1 capacity. This example features a red/orange fiber-optic front sight and maintains matching serial numbers on the barrel, slide, and frame. Glock lists the G40 as discontinued as of 2026, adding interest for enthusiasts seeking this configuration.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Distinct hexagonal rifling with clean, well-defined surfaces.
Specific Condition Notes: This firearm is in solid shape. The exterior shows some scratches and blemishes from prior handling and use. The bore is clean and shiny.
What’s Included
- Glock factory hard case
- Glock Important Safeguards manual
- 1x 15-round Glock 10mm magazine
The long-slide G40 format delivers a 6.02 in steel barrel with hexagonal rifling and a right-hand twist of approximately 1:9.84. Combined with its extended slide, it provides an 8.31 in sight radius with the installed polymer sight set. Slide markings read "GLOCK 40 Gen4 AUSTRIA 10mm Auto."
The Gen4 frame uses the RTF texture with finger grooves and is compatible with modular backstraps. It incorporates Glock’s Safe Action system, an enlarged magazine release, and a captive dual recoil spring assembly. A molded accessory rail on the dust cover supports compatible lights or accessories.
This pistol’s slide includes the factory MOS optics interface and rear serrations, and this specific example is fitted with a red/orange fiber-optic front sight paired with a Glock-style white-outline U-notch rear. Matching serial numbers are observed on the barrel, slide, and frame.
Made in Austria with an import mark of "GLOCK, INC., Smyrna, GA," this G40 Gen4 MOS is a full-size 10mm with a factory 15+1 capacity. Dimensions include an overall length of 9.49 in, height of 5.47 in, overall width of 1.34 in, and a slide width of 1.12 in. Weight is listed at 32.28 oz without a magazine, 35.45 oz with an empty magazine, and approximately 44.62 oz loaded (ammo dependent). Glock lists this model as discontinued as of 2026.