Your ammo is too weak to cycle the slide due to the added weight of the compensator. Try using the 124 Gr again to see if it works without any problems.

 

Welcome from Tennessee and God bless you!

 

This is the inherent risk when using/installing non-OEM parts. I think if they were replaced with OEM parts you'd see the problem resolved. As an example, I've changed my original P365 into a P365X and my P365XL into a P365 Macro using nothing but OEM parts. I've not experienced any issues with either.

 

Good advice in the above posts.

I'd try with the X-Macro grip module & True barrel and without the comp first, for testing.

Also, If it were me, I'd double check to make sure the barrel hood and underside of slide are greased, along with the slide rails and FCU's slide rails. I'd also shoot 100-200 rounds of 124gr nato ammo, which is slightly higher velocity, to break it in.

Let us know how you make out.


.
.

 

As others have alluded, you probably have a mismatch of parts in your new upper configuration, and now do not have an appropriate RSA to properly cycle the slide.

I assume you are running the original 3.1" slide with the original P365 RSA, and have added the new, longer (3.7"?) threaded barrel and compensator.

I may be wrong with my analysis, but...

Maybe the longer barrel may be creating excessive energy for your P365 RSA, and the slide is reciprocating too fast to properly extract and eject the round.

If so, you will need a "tunable" RSA (to create a stronger 3.1" RSA), to better match your configuration.

Not sure how to get there, without trial and error. Maybe others with more experience can help.

Or...if you desire a longer barrel, opt for the XL slide and barrel, with the XL RSA.

I would hope you are not planning to conceal carry this configuration for self-defense. Best to keep your SD firearm closer to OEM, for reliability and less liability, if you ever need to use it.

 

The compensator is delaying the unlock. I don't know anything about the 365s but I do know what a comp does. As mentioned above, if Sig makes one that is actually designed for your gun, I would use that. If not then a lighter RSA is needed.

 

Why did you choose a lower grain?

 

I'd polish the feed ramp. Are you using Blazer brass??

 

Blazer brass and comps don't mix well sometimes. I have 4 or 5 of the Zaffiri comp/barrel combos and they work flawless with stock 3.1" recoil springs.
I think you polish the feed ramp and if that doesn't work. Pick up a DP

M spring kit and start the process of finding a recoil spring that works.

 

That's a sexy gun

 

You might want to consider the Wilson Combat grip for your P365. I find that the Wilson Combat better fits my hands.

 

💯

 

Thanks for all the feedback. So, adding a compensator that steals some of the gas will affect the recoil... Makes me thing of one of my favorite movie quotes. "I only ride'em, I don't know what makes them work."

 

Wilson combat is all I use.
Roger