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Sig P365 XL to X conversion

Discussion in 'Handguns: Autoloaders' started by Balrog, Nov 14, 2022.

  1. Balrog

    Balrog Member

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    I love the grip frame of the XL. Can I put a standard P365 slide and barrel on the XL grip frame and end up with a 365X? Is any fitting required or would this be drop in?
     
  2. powermad

    powermad Member

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    It's all plug n play.
    Swapping in the XL grip was the second thing I did when I got mine.
    V6ubxMcl.jpg
     
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  3. Alllen Bundy

    Alllen Bundy Member

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    It's drop in replacement. I can swap grip modules in less than 30 seconds. Just remember to push out the receiver retaining pin from the right to the left, and re-insert the pin from the left and push towards the right. The reason for this is that the retainer spring for the receiver pin is mounted on the right side. You only need to push the pin about 1/8' to the left before it comes free of the retainer spring.
     
  4. Alllen Bundy

    Alllen Bundy Member

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    I did have an issue with the XL grip module beavertail as received. Someone in another gun group mentioned that the web between their thumb and forefinger would sometimes catch on the corners of the XL beavertail during a draw. I found that I had the same issue.

    The other guy just cut off the beavertail. But I actually preferred the extra support of the beavertail, so I wet sanded a mild radius into the corners of the beavertail. After the radiusing, if my hand is not in the optimum position to draw, the web between my thumb and forefinger just glides over the beavertail and my hand drops into position on the grip module. If you don't know what to look for you cannot tell that it isn't stock.

    You can see the photos in this discussion:
    https://www.thehighroad.org/index.php?threads/p365-x-xl-sas-grip-module-modifications.892045/

    Do note that the P365 and P365XL grip modules allow the FCU to slide front to back about 0.010" because of the oval shaped receiver pin holes in the FCU. Most people don't notice this, but you can actually feel it during the trigger take up if you pay very close attention. It is possible to remove the play by shimming, but I haven't found it irritating enough to bother with it. I also don't know if removing the play will cause any problems. But likely not.
     
  5. rust collector

    rust collector Moderator Staff Member

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    If you would be purchasing the XL sized grip frame, note that there are options such as the Wilson Combat XL sized frame and now, the p365 X Macro. Please also note that some of your magazines may need a different base plate or may not work with the longer grip.
     
    JR24 likes this.
  6. Alllen Bundy

    Alllen Bundy Member

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    Here are photos of the different 12 rd magazine floorplates:
    The 2-Piece P365 12 rd Floorplate on Left. --- The 1-Piece P365XL 12 rd Floorplate on Right

    12RD Floorplates Cropped Corrected Reduced .jpg

    P365 w:12rd XL Mag Reduced.jpg
    You can insert a 12 rd XL magazine into a P365 grip module, but it's a bit floppy.

    There may be times that I need to carry with the shorter P365 grip module and carry with the 10 rd magazine. But I still want to use my 12 rd XL magazines for backup. To make the 12 rd XL magazines more compatible with the P365 grip module, I sanded down the bottom of the original outer piece of the P365 12 rd floorplate to make an adapter ring that can just slide over the 12 rd XL magazine to fill the gap.

    P365 W:12 rd Mag Adapter Reduced.jpg
     
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  7. Balrog

    Balrog Member

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    So I really would not have to do anything except take the slide and barrel off my 365 XL and put on the 365 slide and barrel, right?
     
  8. Alllen Bundy

    Alllen Bundy Member

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    Step 1: Remove the FCU retaining pin. I used a Q-Tip to push out the FCU retaining pin. You only need to push the retaining pin inward from the right side a little bit before you can grab it and pull it out from the left side.
    Remove Pin copy.jpg

    Step 2: Lift the rear of the FCU upwards, and then lift the FCU out of the grip module.
    Lift Rear copy.jpg

    Step 3: Put the FCU into the grip module nose first, then press the rear of the FCU downward until it snaps into position.
    Insert Front of FCU First copy.jpg

    Step 4. Reinsert the FCU retaining pin from the left side and push it inwards until it snaps into place.
    Reinsert Pin copy.jpg

    You can literally change grip modules faster than you can change your socks.
     
    sparkyv likes this.
  9. BoBo522

    BoBo522 Member

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    You can take the P365XL slide assembly off of your XL and put any other P365 slide assembly back on with no fitting, no additional parts, and no other modifications. Most of the replies in this thread cover swapping the polymer grip module, which involves removing the retaining pin before pulling out the FCU - but if I read your post right you were just asking about swapping out slides to turn an XL into an X. Hope this helps.
     
    CapnMac likes this.
  10. Balrog

    Balrog Member

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    Yes, I am just trying to turn an XL to an X. I want a 365 length slide and barrel on my 365 XL frame. I think all I would have to do is change the slide, barrel, and recoil spring.
     
  11. rust collector

    rust collector Moderator Staff Member

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    We did not learn from your first post that you owned both variations already. Swapping the top end will leave you with what is in essence an X model, and a second gun with long slide and stubby grip. A $60 purchase of a longer grip from SIG or Wilson Combat ($65) will let you restore gun #2 to the XL configuration so you have two shooters rather than one sitting in the safe unused.
     
  12. Alllen Bundy

    Alllen Bundy Member

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    We've got some terminology confusion issues trying to use old terminology on modern technology.

    In the past, the grip module and the FCU (Fire Control Unit) of a pistol were the same piece, often referred to as the frame. Today, many people refer to the P365 grip module as the frame. Other refer to the P365 FCU as the frame. Sig uses the terms "FCU" and "Grip Module" and avoids the use of the confusing term "frame" entirely. And don't get me started on what the ATF (Or AFT if you are occupying the oval office) defines as a "frame".

    But yes, all you need to perform the conversion is a P365 Slide, P365 Recoil Spring Assembly, and P365 barrel. It should slide right on.

    Buying individual parts is expensive. From a cost vs value perspective you may be better off just buying or trading for a P365X or buying a P365 and installing an XL grip module. Look at the total value, such as magazines that come with the pistol, etc. Or if you get lucky maybe you can trade slides with someone, or perhaps someone has a complete P365 slide for sale at a good price.

    Also beware that there are two versions of the slide that use different extractors that are NOT interchangeable. To install a new style extractor into an old style slide I believe that you would need to mill the slide.

    Left: Old Style Extractor ....................... Right: New Style Extractor
    P365 Extractor Old.jpeg P365 Extractor New.jpeg
     
    Last edited: Nov 16, 2022
    rust collector likes this.
  13. rust collector

    rust collector Moderator Staff Member

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    The answer to your initial question, without the raft of assumptions I made, is yes, you could simply install the slide, barrel and recoil spring assembly of a standard P365 on the XL grip and fire control assembly. The cost if you purchase the upper parts would be $150 for the barrel, $225 for the slide, and $35 for the RSA, for a total of $410 plus shipping, assuming all parts in stock. If you own the standard model, the cost of installing the XL grip module is $60 plus shipping and suitable magazines or adapters. If you own neither, you would purchase an X model.
     
  14. JR24

    JR24 Member

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    Yes, if you have both just pop the top on the other frame.
     
  15. BoBo522

    BoBo522 Member

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    You are correct, that's all it would take.
     
  16. CapnMac

    CapnMac Member

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    SIG made the X as so many people were buying a 365 and a 365XL, to make the "X" version before is existed, then asking SIG what they could do with a long slide and a stubby frame.

    Later, other aftermarket folk started offering "grip modules" to suit various tastes in such things. Those require monkeying with the fire control group, which, luckily, is pretty simple to swap.

    A similar thing happened when people wanted a Colt "Lt Commander"--you sourced an alloy frame Commander and an Officers Model. You wind up with a similar problem after mounting an Officer's slide on the LWT Commander frame. You have a Commander slide that will not sit pretty on an Officer's frame.
     
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