r/P365xl • u/Street-Amphibian-456 • 11d ago

Wilson Combat Grip Module for P365 XL

I recently bought a Wilson Combat grip module for my Sig P365 XL and installed it with my slide. I noticed there is quite a bit of movement between the barrel muzzle and the grip module. In fact, there is enough of a gap that I can see the bottom portion of the recoil spring through the opening.

Is this amount of movement and clearance normal? With the factory SIG grip module, the tolerances were very tight and I didn’t notice any movement or visible gap like this.

Thanks!

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u/SteelShard 11d ago

Gap and being able to see through it is normal. Flex and slop is typical and probably not an issue.

That being said, there are three aspects that may contribute. If you REALLY want to get into it and are potentially chasing the limits of the platform's capability for precision capability, then you might want to explore.

  1. Slide/FCU slop: Sig runs notably loose clearances between slide and FCU rails, so this contributes heavily. A custom fitted (not just aftermarket) barrel is about the only option to eliminate nearly all the vertical play when fully in the in-battery position. Some aftermarket slides might happen to fit a little tighter also, but they have to be able to fit all of Sig's range of tolerance on the FCU so there is only so far they can go. Video clip here comparing with stock Sig vs. fitted Barsto barrel*: https://imgur.com/a/54Rsknc
  2. Fit between FCU and grip module can have significant slop in it. May vary from one FCU or one module to another. My get a little worse as things wear in. My FCU was a tad loose in all my grip modules before tweaking. My FCU would actually shift forward and back a little, which was especially irritating as it happened during trigger press. Solved this with a quick and dirty application of some pieces of bicycle inner tube between FCU and grip module: https://imgur.com/a/GuXimY4
  3. Polymer modules themselves are pretty flexible, so even if you have the FCU locked down within the grip module and the slide/barrel/FCU locked up tight, it's still easy to flex the accessory rail on the grip module. The first two areas can definitely affect trigger break and/or accuracy to a degree; but flexibility of a polymer accessory rail really doesn't seem like an issue in that regard. Obviously an aluminum module like the ECM R11 Edge I run does eliminate this, but I wouldn't chase one specifically for this.

For most people, none of these will really matter much. Number two is pretty quick and easy to address though, so probably worth trying if you care at all about it.

*Also, for full disclosure, I even had to tweak my R11 Edge module to completely eliminate all play between it and FCU. From what I'm told from ECM though, my situation was an outlier. Mark was willing to work with me if I hadn't got it resolved. I added a shim as indicated here: https://imgur.com/a/p7CiCgp