Holster for GLOCK 17/22 with RDS - 6378RDS ALS Concealment Paddle

In this review the Safariland 6378RDS ALS paddle holster is evaluated for shooters who run full-size GLOCK 17 or 22 pistols with mounted red dot optics and a Surefire X300U. The bottom line: this model is for owners who need reliable Level 1 retention and a concealment-ready paddle that accepts an optional adjustable belt slide; its single biggest selling point is the ALS locking system paired with a protective RDS cover that clears automatically during the draw, offering consistent retention and optic protection.

Key Features

• Model fit: Specifically fits GLOCK 17 and 22 configurations with a Surefire X300U and red dot optic, ensuring a secure, tailored fit for those setups.
• ALS Locking System: The ALS locking mechanism provides positive Level 1 security so the pistol stays locked until released by the intended draw method.
• Protective RDS cover: The built-in RDS cover shields the red dot during carry and automatically rotates away when drawing for uninterrupted sight acquisition.
• Paddle with optional belt slide: Comes with a larger flex paddle and an adjustable belt slide that fits 1.5 in to 1.75 in belts for greater carry versatility.
• Durability and protection: Construction and retention design protect the firearm and mounted accessories during daily use and while holstered.

Who It's For

The 6378RDS suits concealed carry practitioners and duty users who run full-size Glock pistols with compact weaponlights and red dot optics. It is ideal when consistent retention and protection of the optic are priorities, and when a paddle or low-profile belt mount is needed for quick conversion between carry styles.

Those who should look elsewhere include shooters who need universal fit for many different pistols or optics combinations outside the specified GLOCK 17/22 with Surefire X300U, or users who prefer level 2 or level 3 passive locks rather than the Level 1 ALS system.

Pros & Cons

Pros

• Excellent retention and authenticity from the ALS system that secures pistols reliably during movement.
• Automatic RDS cover offers practical protection for the red dot while holstered and clears on draw for quick target acquisition.
• Included larger flex paddle and adjustable belt slide make carry position versatile for different belt widths and preferences.
• Well-made construction and materials that customers report as durable under regular use.

Cons

• Fit is specific to GLOCK 17/22 with a Surefire X300U and red dot; owners of other models or lights must verify compatibility.
• Level 1 security may not meet the needs of users seeking multiple passive lock levels.

Specifications

Model	6378RDS-832-411
Fits	GLOCK 17/22 with Surefire X300U and red dot optic
Retention System	ALS Locking System, Level 1 Security
Mount	Flex paddle with optional adjustable belt slide (1.5 in - 1.75 in)
RDS Feature	Protective RDS cover that rotates away on draw
Use	Concealment and duty with optic-equipped weapons

Our Verdict

The 6378RDS is a strong choice for Glock 17/22 owners who run a Surefire X300U and red dot and want dependable Level 1 retention plus optic protection. It offers good value for those who need a purpose-built holster with a flexible paddle and optional belt slide; just confirm model and light compatibility before purchase.

Frequently Asked Questions

Will this holster work with other lights?
This model is specified for use with the Surefire X300U and red dot setups; compatibility with other lights should be confirmed against the holster's fitment.

What belt sizes does the included slide accept?
The optional fully adjustable belt slide fits belts from 1.5 in to 1.75 in wide.

How does the RDS cover operate?
The protective RDS cover stays over the optic while holstered and automatically rotates away when the handgun is drawn for unobstructed sight picture.