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I think its a sweet idea, but it probably would be useless to me as my 9mm ar is blowback, I need an ejector.

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Something to consider is that the PMag is not a fixed design and the design has changed a couple times already, and there's a large change coming soon with the M3 revision.  The M3 revision appeared to be changing the floorplate mounting.  So, making something to retrofit into the PMag might not be the best option for long term product viability.

Plus, they retail at a higher price than GI type aluminum mags... since the mag is essentially just a shell to hold the actual mag, I would think that using the USGI magazine as a base would be preferable.

It's also a consideration that folks in ban states might have preban USGI type mags, which would allow them an option that would not be available otherwise for alternative calibers.

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So your saying, you can make internals to make a pmag work for firing 45acp? Just need an upper with the proper barrel and bolt?

I would go for that in a hart beat. (pending funds of course)

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That is not a bad idea. My only question is that which pistol caliber uppers would the inserts work with?   I would not mind building a 9mm/40/45 system.

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I run PMAGS only, as does everyone else i know with an AR. A retro fit option would be great but if they are changing there product and have a couple times already ensuring the right fit would be difficult. Since you work in a factory that allows use of their equipment, and are making a body filler and new follower. Have you tried making the shell as well? or making a shell that includes the body filler as part of the design?

Also if the modifications were permanent these mags may be in a legal grey area in some states since they could be converted back to 30 round mags, and those living in places like that would be able to purchase a 10 round dedicated mag from you but not the kits to modify a 30 rounder since they couldnt buy the PMAG.

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I would think just making mags for whatever caliber/version you want that fit the AR magwell would be easier and not restrict you to a certain magazine to use as a shell. That would also eliminate all the dimensional uncertainties of using some other manufacturers product as a base for your design to work.

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Inserts for the mag well or inserts in the mag, how about neither

If your going the plastic route just build a mag that works with whatever pistol round you want, but with the outside like a AR mag, a la blackdog.    

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this.


no matter what mag you have its still going to be an involved process to swap out the internals for a pistol cartridge. A conversion kit would be about the same production cost as a new mag. I  for one would rather have a full size mag foe whatever cartridge i am shooting. Dropping the floor plate, yanking the spring and follower, and replacing all of it, seems like a major PITA when i could buy a few dedicated mags. If you are going to invest in an upper a few mags shouldn't be an issue especially when the conversion wont save money.

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If this works for 9mm, and still holds the bolt on last round, and works like it should, I am in.

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No. This one is for the PMags. I didn't think to put that in the post. It's appearance is a little rough, but the fitting and positioning on the floor plate is perfect. Nice close but not tight fit on the tab part holding the bottom piece on, but a closer fit than the original stock piece.

I've come to the conclusion that making a USGI mag hold 45 isn't gonna be easy due to all the flexing. With some permanent mods, it can be done. However, one of my goals with this is for there to be no need for permanent mods. That way people can have the change over kits for mags they already have, while having an upper in pistol caliber, but if they ever sell it, they can keep the mags due to being able to change them back to original setup. A 20 round USGI mag may work better due to the shorter body, but I don't have one to test out on the flexing.

And to be quite honest, I currently have no plans to pick one up, seeing how only 6 of the 84 votes on the other thread are for a 20 rounder. I really wish more people would add a vote on this... 84 votes out of over 1500 views (even though 12 of those votes don't count as they were basically no's to my question. That's less than 5% voting. Numbers like that would make someone less persistent to just drop the project, make a few for himself, and forget everyone else that doesn't have the needed skills or equipment.

Even more so, the post I did asking for emails to get a list going to see if doing a mold would be a viable option. I have yet to have a single email about it, so there must not be that must true interest in it.
I didn't want to add this in the post, but anyone that signed on in the beginning for the updates would get a free kit or a decent discount for helping getting this going. That was going to be something added into the email updates, so I wouldn't all of a sudden get a hike in interest and everyone wanting on the list due to that small detail. (Kinda like some of the posts in the EE, where someone says first however many gets it for free, or yada yada)

If you're still reading this, thanks. It's nice to know someone actually reads the entire posts. And also sorry for the ranting, but with no information coming in that I minutely need, I can't get a good forecast on how/where this product will end up. Kinda like the Magpul PDR, not enough interest from the military for contracts so they snubbed it.

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Looks pretty sweet, I definately wanna see an update.  If you need more input, I would like to see .45 or 9mm.  What is a possible price for a conversion kit?

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Looks great, how far away are functioning mags?

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I understand how your feeding modification works with a locking bolt and direct impingement (DI) operating system as the plunger ejector is retained.  How would this magazine work on a direct blowback system? The magazine block incorporates a fixed ejector.

Interested in a response to this. I would be interested in the product for DI application in a 45 acp upper but DI system pistol uppers are rare and probably account for less than 1% of pistol caliber rifles, severely limiting your market.

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I've been subscribed to this thread from the beginning.

OP, any chance you could make versions compatible with Oly style uppers?
Might be difficult since they feed from the front of the magwell as opposed to the middle though.

I have a 40cal gun that I love.

Posted by Therealkoop;
I think its a sweet idea, but it probably would be useless to me as my 9mm ar is blowback, I need an ejector.

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Any progress?

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Long before I became a member (last week). Long before I bought my first AR 9mm part (lastI month). Long before I decided I would build a 9mm (last December), I added this thread to my favorites. I have 3 usgi 5.56 magazines that I stare at thinking about ways to make what your talking about doing happen.
Please do this.

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I can't pretend to know what obstacles you're up against. However, I say you get a prototype together and kick start it. A guy raised over $20k last year to develop covers for an aimpoint red dot.
I would be among the first in line to donate money to your kickstarter campaign if you can make it happen.
+1
kickstarter campaign for lens cover

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How about 7.62x25? Most conversions use PPs43 mags with an insert, but the dimensions on the surplus mags vary widely. I am thinking curved inserts at the front and rear of a metal 30 rounder, shaped to recreate the internal dimensions of the PPs-43 mags. Then use the PPs-43 spring and follower. Maybe work with Ron Williams.

Posted Via AR15.Com Mobile

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Add the ability to use the existing mag release somehow on the Pps mag - the shell should have a way of being retained in the lower (maybe insert from the top?) and allow the AR mag catch to latch to UNMODIFIED Pps43 mags.... that - to me- would be the ultimate adapter.  It is what I tried to design and get produced but it always seemed to get lost in translation...