Custom Build Compatibility

valcosty said:

Hey guys! I've been trying to figure out the compatibility of parts for a custom build. I have a Sig p320 XFull in 9mm, and I was looking to get a GGP320 compact slide. I know it fits with the X series grips, but requires a standard barrel. My two questions are:
1. Will any non-X series barrel fit with an X series FCU and grip module?
2. Do I need a compact threaded barrel or a full size threaded barrel if I want to fit a compensator on it?

Thanks for the help!

Click to expand...

1. The barrel just has to be compatible with the slide. If the slide is compatible with the grip module and FCU then you're good (which the GG slide will be). Non-X-series Slide/Barrel combos will work fine with an X-series FCU/Grip module.
2. For 3.9" compact/carry slide you will need a 4.6" threaded barrel for a compensator: P320 COMPACT 9MM 0.5X28MM THREADED BARREL, NO LCI, 4.6"
for a 3.6" xcompact/subcompact slide you will need a 4.3" threaded barrel for a comp: P320 XCOMPACT/SUBCOMPACT 9MM THREADED BARREL, NO LCI, 4.3"

The compact/carry slide plus comp with hang just past the XFull dust cover. The xcompact/subcompact slide plus comp with usually be flush with the XFull dust cover (depends on length of the comp).

Tips on barrel:

• Make sure the thread pitch on your barrel matches your desired comp: 0.5x28mm vs 13.5mm
• Make sure you get a NON-LCI (loaded chamber indicator) if you ever intend to have an optic on the gun. The LCI notch vents some exhaust gas up and coats the optic.

Below is my full sized TXG grip with a sig spectre compact/carry slide (normally 3.9" barrel), with a 4.6" threaded barrel and Harrington arms dual port comp (HC320XL).