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View Full Version : Want an AR ProMag with a Magpul Follower?


PLINK
02-16-2007, 1:49 AM
Well, I know I am not the first to do this but I thought I would share the info. We all know the 10 round ProMag AR mags can be problematic. Mine would not feed the last round. The same thing happened with the ProMag that came with my CA Vulcan receiver. Anyway, I first pulled apart the ProMag and noticed that the follower is not a standard USGI follower. The ProMag follower does not have any feet. It also should be known that it is the mag body that is the limiting factor on the round count (notice the semi circle shapes on the follower). So basically what I did was:

1. Remove the floor plate. This was on pretty tight. You may need to stick a screwdriver in the hole to help slide the floor plate.
2. Remove the spring and follower.
3. Bend tabs on mag body with needle nose pliers (the pics show only 2 bent but I had to bent the other 2 to get the Magpul follower in).
4. Bust out my new favorite tool, the Dremel and attach the small round sanding attachment.
5. Duplicate the semi circles of the green ProMag follower with the Dremel on the Magpul follower.
6. Slide finished Magpul follower into mag body to make sure there was no binding.
7. Re-bend tabs on mag body using needle nose pliers
8. Reinstall spring and floor plate.

You now have a vintage looking mag with an awesome anti-tilt follower. I will be testing it this weekend but don't foresee any issues. I loaded all ten rounds in the mag (only 10 fit like it should) and stripped them all out by hand. Everything seems fine.

You may ask, why would someone do all this?

Well, some people may want to do an A1 build. I hear NDS is coming out with a vintage cut lower soon. This mag would work perfect for that application.

What did it cost?

I bought the mag at the Cal Expo gun show for $15.00 and the follower was $2.08 from Copes. I ordered an Orange follower but a gray one showed up. I did not care either way.

The tool used was a Dremel kit I bought at Home Depot for $100.00. I am sure you could use a rat-tail file if you wanted to.

http://i119.photobucket.com/albums/o133/PLINK223/FS/100_1607.jpg

Finished modification:

http://i119.photobucket.com/albums/o133/PLINK223/pro%20mag%20conversion/follower2.jpg

Finished comparison:

http://i119.photobucket.com/albums/o133/PLINK223/pro%20mag%20conversion/follower.jpg

http://i119.photobucket.com/albums/o133/PLINK223/pro%20mag%20conversion/follower3.jpg

PLINK
02-16-2007, 1:51 AM
Finished product:
http://i119.photobucket.com/albums/o133/PLINK223/pro%20mag%20conversion/Follower4.jpg

Installed:

http://i119.photobucket.com/albums/o133/PLINK223/U-15/Vulcan-1.jpg

Jicko
02-16-2007, 7:52 AM
I never had one of these mag, what limit the 10 rounds?

PLINK
02-16-2007, 8:59 AM
I never had one of these mag, what limit the 10 rounds?


The mag body is the limiting factor.

http://i119.photobucket.com/albums/o133/PLINK223/pro%20mag%20conversion/ProMag.jpg

C.G.
02-16-2007, 9:03 AM
Why not just buy a Bushmaster or maybe a C products mag and be done with it?:confused:

WhiteGT
02-16-2007, 9:07 AM
Easy, that one looks cooler. :D

Nile
02-16-2007, 9:18 AM
If you shoot (NRA) service rifle the mag has to be straight. C-products and bushmaster do not comply. Bush master sells a 10/20 mag on their web sight for the bullpup rifle, it is a promag. I know I purchased a couple.

PLINK
02-16-2007, 9:21 AM
Why not just buy a Bushmaster or maybe a C products mag and be done with it?:confused:


We all know the 10 round ProMag AR mags can be problematic. Mine would not feed the last round.




You may ask, why would someone do all this?

Well, some people may want to do an A1 build. I hear NDS is coming out with a vintage cut lower soon. This mag would work perfect for that application.



1. I already had the magazine and it was not working properly. Simply add a $3 part and an half hour with some tools and have a functional mag.
2. Bushmaster mags do not come apart easily.
3. I wanted to put this mag back in my CA Vulcan because that is what it came with. The mag that came with the Vulcan was doing the same thing and I removed it (legally of course with features removed). If the DOJ wanted to give me crap on the only fixed mag build I own, this lower is still configured the way I bought it from the local gun shop that came with the stupid CA DOJ aprroval letter. It has a blind roll pin keeping the mag from being easily detachable and the epoxy has been replaced.

The C-Products magazines are very nice. They are my first choice and are cheaper in price too.

PLINK
02-16-2007, 9:57 AM
If you shoot (NRA) service rifle the mag has to be straight. C-products and bushmaster do not comply. Bush master sells a 10/20 mag on their web sight for the bullpup rifle, it is a promag. I know I purchased a couple.

http://www.bushmaster.com/shopping/magazines/30-425.asp

http://www.tenpercentfirearms.com/index.php?main_page=product_info&cPath=10&products_id=150

Does the magazine have to be a certain length? The C-products 10 rounders have a straight body.

The C-Products 10/10 round magazine are very nice. I have a few of them. I just wish they were a little longer.

tenpercentfirearms
07-20-2007, 10:32 AM
I too am not understanding how it stops at ten rounds. If you can slide the follower in from the bottom, then doesn't it go all the way back down to the bottom? I have one of these in my garage and will have to explore this when I get back from vactation.

Prc329
07-20-2007, 10:39 AM
The body blocks the round itself not the follower. The body is designed in such a way that it prevents the rounds from going any further. It narrows the mag and the follower has to be modified to go in to the body. 2 notches must be made in the follower. This may be the reason some are having issues. If the notch is cut wrong it may cause the follower to do weird things.

I had one that would pop the 10th round out and lock the carrier back. Once I changed to the magpul follower all was well.

bwiese
07-20-2007, 10:52 AM
I dunno, it doesn't look too "permanent" to me - and this is one area where concept of permanence is actually codified in a few places in CA gun law.

That blocking bulge could be pried outward with a screwdriver allowing an 11th round to be contained and occasionally feed properly. If it can do it even once, it's a problem - not only is the mag illegal, but a semauto fixed mag rifle it's attached to becomes an illegal AW.

I think it's unwise, call me paranoid. But then some smart lawyers I've spoken about complexities of CA magazine law with agree.

Turbinator
07-21-2007, 7:06 AM
That blocking bulge could be pried outward with a screwdriver allowing an 11th round to be contained and occasionally feed properly. If it can do it even once, it's a problem - not only is the mag illegal, but a semauto fixed mag rifle it's attached to becomes an illegal AW.


I believe the mag is held together by that blocking bulge. If you pry it out, the mag falls apart - in half where the seam is. The seam is very clearly visible in his pictures.

Turby