Posted: 3/5/2020 5:06:54 PM EDT
Remove your mag catch. Do whatever you want with it, you won't be needing it anymore. 
Measure 1.675" from the mag catch slot down the front of the grip. 
Draw a line from the previous mark not quite perpendicular to the grip. Then cut, leaving the back strap in place. 
Now take your baseplate and overlay it on the grip. Trace around it and repeat on the other side. 
Install your custom mag catch. Do not remove material all the way to the line, just use it as a guide testing fit often. Once the mags lock in place, you're done with the frame. It will now work with 365 mags. If you don't care about your slide locking back on empty, you're done. 
You'll notice the slide lock ledge on the 365 follower (left) is too short to activate the slide lock on the Glock. 
Remove the guts from the mag. Take a G26 follower and remove a tiny bit from the tail end until the overall height matches the 365 follower. (365, G26 modded, G26 unmodded) 
Bend out the leg on the base of the G26 mag spring so that it fits the 365 lock plate. Install in your 365 mag. 
Send it to a pro for stippling |
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Quoted:
Neat Who makes the mag catch? Does using the G26 follower and spring reduce the mag capacity? No. G26 mag is actually shorter than the P365 mag by a tiny bit. The mod to the follower isn't necessary, but it does make loading the 10th round easier. |
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Quoted:
So did you convert a 43 or a 43x like in the title? Quoted:
Quoted:
10 rounds instead of 6 in a gun that's the size of a G43. |
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Boy if this proves reliable the OP has opened Pandora’s box.
I’m in the camp that will not buy a Sig firearm. I will not trash talk but the last two I had bought had issues that left me sour. This is a very cool concept. I carry at work but with dress shirts tucked in a g43 is as large as I can go before comfort and printing issues. I keep a g19 with 20rd mags in my computer bag. It’s a PITA because I have to keep retention of the bag or lock it up out of reach. This is a great concept but I am waiting for range reports before I get to excited. |
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Quoted:
2 questions: Is this cutting on a 43 frame or a 43x/48 frame ? Can I just use any aftermarket metal mag release or did you have to grind on an aftermarket to get it to fit? I really like this if it could make my 43 hold a ten round mag! |
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Quoted:
Boy if this proves reliable the OP has opened Pandora’s box. I’m in the camp that will not buy a Sig firearm. I will not trash talk but the last two I had bought had issues that left me sour. This is a very cool concept. I carry at work but with dress shirts tucked in a g43 is as large as I can go before comfort and printing issues. I keep a g19 with 20rd mags in my computer bag. It’s a PITA because I have to keep retention of the bag or lock it up out of reach. This is a great concept but I am waiting for range reports before I get to excited. |
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Quoted: Highly doubtful. As has been addressed, the 43 is too narrow to accomadate the mag. |
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Quoted:
Yes, I'm specifically talking about the 43X with the P365 15 round magazines. After looking at the magazines again, I think the 12rnd magazine for the P365XL would be worth a shot. Quoted:
Quoted: Highly doubtful. As has been addressed, the 43 is too narrow to accomadate the mag. |
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Quoted:
Josh, would it be easier to trim off the ears of the the 365 base plate, or are they part of the locking mechanism? |
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Quoted:
Yes, Omaha Outdoors. I started this before they'd announced theirs. Quoted:
Quoted: There is already a company developing a p80 frame for the 43 that takes 365 mags. |
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Quoted:
Boy if this proves reliable the OP has opened Pandora’s box. I’m in the camp that will not buy a Sig firearm. I will not trash talk but the last two I had bought had issues that left me sour. This is a very cool concept. I carry at work but with dress shirts tucked in a g43 is as large as I can go before comfort and printing issues. I keep a g19 with 20rd mags in my computer bag. It’s a PITA because I have to keep retention of the bag or lock it up out of reach. This is a great concept but I am waiting for range reports before I get to excited. |
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Quoted: Unless it's a new statement from them, the 43 mags were in process before the 43x/48 mags even started. I wouldn't hold my breath on that rumor. |
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Quoted: Glock has to be at least considering a model cross and metal magazines. I doubt it. At least not for another 20 years. They seem to be stuck on plastic coated mags for some reason? I mean they do finally respond to customer input and demand after a few decades. It only took them 30 years to come out with a .22 LR version of one of their pistols. Then they only had 10 round mags and an OPTIONAL threaded barrel for another $150!  So I'm sure Glock will get right on that metal mag! 
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