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Correcting Fitting Issues on the X300U-A

One of the most common complaints we hear with the X300U-A  is fitting issues or excessive “wiggle room” when on the gun. Luckily there’s an easy fix for this! If you’re curious about the differences between the X300U-A and the X300U-B models, we have a side by side comparison article that you can read HERE. If you’re missing just one or two pieces, we’re offering to replace some for FREE. Request the parts you need HERE. If you need a complete replacement kit, we have the Surefire Z89 Kits HERE.

First start by removing the 6 screws with the provided wrench. Sometimes fit issues can be resolved just by tightening these ¼-½ a turn so it may be worthwhile to try that first. If that doesn’t fix the issue, just continue on to the next steps.

I prefer to remove the battery door while working on the light. It’s not needed so you can leave it on if you want to. The door just pops on and off.

Your X300U-A should come with several pieces in the package. The Universal Mount (marked “U”, pictured center) is usually pre-installed and works well with most pistols. There is also a Picatinny Mount (marked “P”, pictured left) which can be used on handguns or handguards that have a picatinny rail. There is also the Rail Lock (pictured right) which can be used on nearly everything and will give you the tightest fit. The Rail Lock is also adjustable so you can dial it in to get the perfect amount of tension.

Start by laying the rail lock flat on the desk as shown. Inset the small silver wedge and start to thread the screw in through the side.

Next, lay the assembly down on the body of the light as shown. You’ll notice the screw fits into a slot on the side of the light.

Also in the package are two cross sections marked “P” & “U”. For picatinny rails, use the “P” and for everything else, use the “U”.

You will install this on the front of the light body as shown. You will probably need to slightly raise the rail lock mount assembly installed earlier in order to get it to line up properly.

Here is what it