About GEN4 - 5 - MOS


GLOCK Gen4 Pistols

GLOCK Gen4 pistols have a few key innovations that make the gun suitable for smaller profile hands and varying experience levels: interchangeable backstraps, a reversible magazine catch, a dual recoil spring assemble, and a rough textured frame.

Modular Back Strap System

GLOCK Gen4 pistols come with a modular back strap system, allowing you to choose the back strap that best fits your grip without changing your grip angle. Two back straps are included with your Gen4 pistol: medium, which adds 8/100 of an inch from the back of the grip to the trigger, and large, which adds 16/100 of an inch. The smallest back strap is incorporated into the frame of the pistol.

Enlarged Reversible Magazine Catch

The magazine release catch of the Gen4 is reversible and enlarged, allowing you to easily switch the catch to the left or right side of the pistol with no additional parts.

Dual Recoil Spring Assembly

The Gen4 pistols have been upgraded to a dual recoil spring assembly. The dual recoil spring assembly noticeably reduces the recoil you feel, while simultaneously increasing its lifespan.

Rough Textured Frame

The Gen4 has a new Rough Textured Frame (RTF) surface designed to enhance grip traction, present on the frame as well as the interchangeable back straps.

GLOCK Gen5 Pistols

Introducing the Gen5 family which includes the G17 Gen5, G19 Gen5, G34 Gen5 MOS and G26 Gen5. GLOCK Gen5 pistols are the latest examples of GLOCK'S constant pursuit of perfection. Gen5 pistols feature over 20 design modifications from their Gen4 predecessors, including the GLOCK Marksman Barrel, nDLC finish, ambidextrous slide stop lever, the removal of finger grooves and a flared mag-well. These changes deliver improved accuracy, durability, performance, control, and flexibility whether you are on the range or in a situation where fractions of a second matter.

What is MOS

GLOCK Modular Optic System makes it easier to mount optic sights on your GLOCK pistols. Optic sights are popular in competitive shooting and are becoming increasingly more popular for home defense and target shooting.

The MOS system allows you to add additional tall iron sights, so you have a backup in case the optics fail.

Faster target transition

Quicker sight acquisition of your target

Improved accuracy at both long and short range


What’s the Difference Between Reflex Optics (MOS) and Standard Iron Sights?
With Reflex Optics (MOS), you look through the reticle and focus on your target with the dot aligned to the target.

With standard iron sights, you align the front and rear sights with a hard focus on the front sight.


What is the Importance of Dot Size?
Large dots are easier to see in bright light and close range, while smaller dots are better for low light and longer distance targets.