Sig P365 HIGH CAPACITY 14 rd Ultra MAGAzine Holster

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Alllen Bundy

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Murderapolis, Minnesota
A pile of leather scraps and idle hands and I now have a magazine pocket holster for my P365X 12 rd MagGuts 12 + 2 modified magazines.

I oriented the rough side of the leather towards the inside of the pocket to make to more difficult to come out of place during a draw. The smooth side of the leather is towards the magazine. I needed to move the magazine as far towards the outside edge of the pocket as possible, so that I could sit comfortably with the magazine inside my rear pocket.

I started by cutting a piece of leather to fit my rear jeans pocket. I used some rubber cement to glue on another piece of leather to form the magazine pouch and stitched one side of the leather in place. I covered a magazine with some plastic, wet the leather and stretched it over the magazine and let it dry.

Formed Leather Mistake.jpg

That seemed to work well enough to form the leather. BUT I FORGOT to take into consideration the magazine floorplate protruding beyond the magazine shell and the fit was very sloppy. DOH!

Formed Leather Slot Cut.jpg

Next I cut a slot in the leather so that the protruding edge of the magazine floorplate could fit into it. But that just caused problems with the magazine hanging up on the edge of the slot when I drew the magazine from it's holster.

I decided to re-wet the leather and reform it. But this time I used a wooden form that I had previously used to form ABS plastic over. I first heated the wood to drive off any moisture and then melted beeswax over the wooden form to make it water resistant and wiped off the excess beeswax. Then I clamped the wet leather in place over the wooden form and let it dry.

Clamping Leather 1.jpg Clamping Leather Weight.jpg

I stitched the formed leather down to the pocket sized piece of leather and then I started cutting away anything that was getting in the way of the draw. I cut a notch into the top of the holster to accommodate a 10 rd P365 magazine. But that turned out to be a bad idea and I will not do that again. I'll make a separate holster for the P365 10 round magazine instead.

Cut back top.jpg Cut back and stitched bottom.jpg

Triple stitched.jpg

The magazine was still too loose in the pouch, so I added a 3rd row of stitching along side of the magazine to tighten up the magazine pouch. The retention is sufficient to hold the magazine in place when you turn the holster upside down and shake it a bit. But most of the magazine retention is provided by the jeans pocket itself.

As you can see, I have sewn and re-sewn this leather multiple times trying to make the holster design workable. it's not pretty, but this is a proof of concept prototype.

I went for a long bicycle ride and the magazine holster worked great. It kept the magazine in an upright position in my rear jeans and it is easy to draw. It is also comfortable to sit with the magazine in my rear pocket

But the holster was also quite damp after a long bike ride. Waterproofing will be necessary. I will probably just heat the leather hot enough the melt beeswax onto it and wipe off the excess wax.

I plan to re-create this magazine holster with horsehide, as it is supposed to be more sweat resistant.
 
I waxed the holster using a heat gun to melt the wax onto the holster. I wiped off the excess wax while it was still hot. I also noticed my index finger as getting hung up on the leather in the upper right corner of the photo. So I cut a more gentle radius into the corner. The wax seriously stiffened the leather, but it will still flex into shape.

Mag Holster Waxed.jpg
 
After wearing this magazine holster in my back pocket it has conformed to my body. I'm not sure if humidity plays any part in the holster conforming to my body, but when I remove the holster from my rear pocket after a long bicycle ride, there is condensation on the leather and also on the magazine. My next experiment is to punch holes in the leather to allow for more ventilation inside my pocket to see if I can eliminate the condensation, yet still have enough stiffness in the leather to hold the magazine upright inside my pocket

From what I have been reading in this forum, it appears that I should have heated the magazine holster while while it was drying, as heat releases collagens inside the leather basically gluing the leather fibers together and setting the leather into it's final shape. I can say that after the initial wet forming, although the leather took a set, it felt a bit floppy. When I remake this holster from quality horsehide I will trying heating the leather while it is drying during the wet forming, essentially "baking" it dry.

I believe that it is the beeswax that I impregnated the leather with that is actually holding the leather into shape. I do think that there is too much wax impregnated into the leather. I may test a scrap of leather with beeswax dissolved inside a solvent. I should have better control of how much beeswax is added to the leather.

I did cut down the top of the holster about 1/4" further to allow better access to the magazine. Functionally, the holster is working fine. It holds the magazine upright and to the left side of my pocket and I can sit comfortably with the magazine in my rear pocket. So far I'm mostly happy with the results. I should make it clear that this holster does NOT offer any retention whatsoever. All of the retention is done by my rear pocket

Top View Smooth Side Rotated.jpg

Top Smooth Side No Mag Rotated.jpg

Backside Curved Rotated.jpg
 
That is excellent work. Makes me cower in shame that I can’t do that type of work. I have used beeswax as a finish for wood. My Roller is finished with it. Anyhow looks great.
 
That is excellent work. Makes me cower in shame that I can’t do that type of work.

This is a lot easier to make than you might think. There are plenty of YouTube videos to show you how to do basic leather work. Not to mention that any leather worker could point out a number of finishing steps that I omitted. I didn't bevel the edges. I also didn't use a grooving tool to make grooves for the hand stitching to fit into.

If I pocket carry my pistol I need someplace to carry a spare magazine. This was just a proof of concept magazine holster to see if carrying in my rear pocket was even feasible.

I'll be buying a leather edge beveling tool and a grooving tool before I remake this from horsehide.
 
Here is a photo showing the condensation that forms on the holster and magazine after a long bicycle ride. This photo was taken after a 16 mile ride.

Mag Holster Condensation.jpg

I plan to use a leather punch and make a lot of small holes to improve the ventilation. Hopefully the holster will remain stiff enough to hold the magazine upright.
 
I punched a bunch of holes into the holster and that eliminated the condensation on the holster and reduced the amount of condensation on the magazine. I punched about 30% more holes to improve the ventilation even further.

The holster is still holding it's shape, but it is a little bit more flexible now.

Holster Mag Swiss.jpg

My made in England Craftsman leather punch with the rotating head is crap. The punches do NOT meet the brass pad perpendicularly and only one edge of the punch actually goes all of the way through the leather and contacts the brass pad. Even when using a piece of scrap leather behind the holster it doesn't punch holes cleanly. I had to clean up the back side of the holes using a scalpel.

Leather Punch Cracked.jpg

Also, one of the punches actually cracked. I need to buy some decent leather punches
 
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The extra holes still did not prevent condensation on the magazine. There needs to be more airspace between the magazine and the inside of the pocket that is against my butt. I think that a leather flap the length of the magazine would work. But the front and backside of the magazine still need to be exposed so that I can grab it with my thumb and forefinger. I could try to sew on the extra flap of leather, but it won't be that easy. I think that I will incorporate the flap when I remake this holster from horsehide.

Magazine Condensation.jpg
 
I punched a bunch of holes into the holster and that eliminated the condensation on the holster and reduced the amount of condensation on the magazine. I punched about 30% more holes to improve the ventilation even further.

The holster is still holding it's shape, but it is a little bit more flexible now.

View attachment 1102162

My made in England Craftsman leather punch with the rotating head is crap. The punches do NOT meet the brass pad perpendicularly and only one edge of the punch actually goes all of the way through the leather and contacts the brass pad. Even when using a piece of scrap leather behind the holster it doesn't punch holes cleanly. I had to clean up the back side of the holes using a scalpel.

View attachment 1102168

Also, one of the punches actually cracked. I need to buy some decent leather punches
That's an inherent issue with the design,not the quality of the punch. At least, in my experience.

To solve this, I bought two sets of drive punches (SAE & metric). Granted, these are cheap Chinesium, but it was more as a way to find out whether I liked them or not, but I don't have issues with these at all.
IMG_20220916_171017.jpg

Another solution to this is what I call a parallel punch (no idea what they're called, that's what my old man called it when he gave it to me).

IMG_20220916_171046.jpg
 
I bought a proper edge beveler for leather and shaved the edges more rounded. Note that I shaved the inside edge of the magazine pocket and it no longer catches on the magazine when I insert it into the holster.

Mag Holster Beveled Up.jpg

I have not yet rewaxed the bevels that I cut into the edges of the leather, which can be seen by the lighter color. The beveling that I did on the right side made it easier for my index finger to glide along the side of the magazine in order to grasp it. I really need a slightly wider beveler in addition to the one that I used. But even this less than ideal beveling made a noticeable improvement.

Mag Holster Bevled Full.jpg

Beveler Punch.jpg
 
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