I have two of these now. One on a 10mm and this one on a 9mm. The laser adjusts to where the bullet impacts and is activated naturally when you grip the pistol for firing. This laser still lets you use most of the available holsters, and any leather or kydex type holster could be trimmed around the area of the laser to fit. I can remove it for cleaning and upon reinstalling it, the laser still holds zero. The laser on the 10mm is 8 years old and I have had no issues with it. The only part you have to replace are the batteries. No overpriced guide rod springs or mini batteries that only last 4 hrs.
Verified purchase: Yes | Condition: New
Works with all holsters and is very easy to install. Comes on automatically when gripped.
Verified purchase: Yes | Condition: New
The 639 has the on/off switch which allows you to practice your marksmanship with it off and turn it on for normal everyday ops when you need the laser to offset adrenaline effect in a real time encounter
Verified purchase: Yes | Condition: New
I have one on every weapon I have and it helps when glasses are in the way.
Verified purchase: Yes | Condition: New
This laser is outsanding. I prefer it over any rail laser. Grip feels great too!
Verified purchase: Yes | Condition: New
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