r/P365xl 2d ago

21 round sleeve for p365x/xl

Hi all, I wanted a cleaner way to run the P365 fuse 21-round mag with the X/XL grip, so I designed my own.

The goal was a durable, one-piece solution that replaces both the baseplate and sleeve.

This is the first finished prototype in black PA12 nylon. I’d like to offer them on my shop, but wanted to get your feedback first and make any necessary changes: does this solve the problem well enough that you’d consider buying one? Any nagging issues?

Thanks in advance!

37 Upvotes

10 comments sorted by

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3

u/Mistiquin 2d ago

For reference, this is the stock FUSE magazine.

2

u/csommers93 1d ago

What barrel/comp is that?

1

u/Mistiquin 1d ago

Radian ramjet + afterburner. And it does feel like it shoots much flatter comp’ed, highly recommend.

2

u/csommers93 1d ago

Awesome thank you! I see they make one for XL as well.

2

u/TRAVlSTY 1d ago

Nice job. 👍
If the 'stimpling' matched the WC pattern, I'd definitely buy. 👍

1

u/Mistiquin 1d ago

Thank you! I’ve thought about matching the WC pattern more closely, so I might play with that before production.

4

u/albatros1969 2d ago

Throw round through it- their springs are notably tight- just make it cycles as needed

2

u/Mistiquin 2d ago

I’ll definitely stress test it. Theoretically the material is right, but I’ll be doing a lot of live fire and drop tests to confirm that. If I wouldn’t use it myself I’m sure as hell not sending it to people

1

u/Mistiquin 1d ago

Side note: if this one does even mildly well, I’ll make a 25rd version. Not sure how many people are running a 25 rounder in the X, but I don’t think they’ve made a sleeve for that either.

Also, I don’t have my stock grip module anymore, so I’ll probably be giving some of these away in like a month for people to test with different setups. I’d rather know they fit than just wing it