Gen 5 X300 fitment issues

[Trajan]

So I have an X300T-A and it fits great on my Gen 4s with the U rail. As many know, the gen 5s have a wider P notch, leading to wobble with the U mount. The problem is the P mount extends beyond where the U mount is, but on the glock the extra space is behind the bar. I've started to try shaving the P insert down a bit so I would at least get a snug fit, but now the light doesn't sit right, being angled up a bit and the battery latch protrudes past the bottom of the trigger guard. More probably needs taken off.

Has anyone made X300-As (without the spacer) work on Gen 5s without being extremely loose? Should I just continue trying to "fit" a P insert?

[Pnut]

I don’t have a gen 5, but I own several X300 on different guns…. If the problem you are having is the battery cover/switch is hitting your trigger guard using the proper plate, then I might have a solution. If you look at the battery cover, there is a small plate that can be removed by drifting out 2 tiny pins. This allows the light to sit back about 1/8”

These are the 2 pins that need to be removed


This is the filler plate

[Trajan]

I don’t have a gen 5, but I own several X300 on different guns…. If the problem you are having is the battery cover/switch is hitting your trigger guard using the proper plate, then I might have a solution. If you look at the battery cover, there is a small plate that can be removed by drifting out 2 tiny pins. This allows the light to sit back about 1/8”

These are the 2 pins that need to be removed


This is the filler plate

Unfortunately, the newer x300s no longer have that spacer.

[TCB]

Things I’ve used and had success with; a small patch of loop Velcro, duck tape and a cut down guitar pick (Fender heavy) to tighten up that area over the years…

[Trajan]

Things I’ve used and had success with; a small patch of loop Velcro, duck tape and a cut down guitar pick (Fender heavy) to tighten up that area over the years…

Are you just putting it under the rail?

[TCB]

Usually on the back where that spacer used to be. A small patch of loop Velcro seems to work the best for me. It compresses down and just fills up the gaps a bit adding stability. If you want a more solid fitment than that get the B model.

[Trajan]

So I have no idea what's going on. I decided to try shaving the extension on the P latch and it still wouldn't fit right. Took it completely off and tried the rail latch again to take a video for Surefire support and it fit perfectly.

Well I'm glad that's working, but I wish I knew why it wasn't working. Googling around others have had the same issue. Perhaps there's some variation in the mounts, or different screw pressure.

[757_Magnum]

I noticed this with my X300U-As with the P mount on my G19.5s. I just give the light bezel a firm push and they click in to place. Give the light a tug afterwards to make sure it's seated. I stupidly launched one over the firing line at the range one day when I didn't check.

[Magsz]

You should not have to file anything down in order for the light to fit your gun.

As others have said, press the bezel into the gun and the P latch will click into place. The newer P latches are very very thick and require a little bit of force to get them to seat.

I have five different X300's on five different gen 5 guns and they all fit this way. None of them required any additional filing or fitting.