Rifles Misc All rifles not covered elsewhere!

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Old 02-09-2010, 21:19   #1
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Ruger PC4 and Pro Mag 20rders

First things first. I tried searching for relevant data on this, but the search engine refused PC4 and PC40 as search terms for being too short. Carbine, Ruger and police brought back most of the site as results, so here we go.

I bought a Ruger PC4 police carbine a while back and have only recently started shooting it. With the 3 factory 10/11rd mags that came with it, I have no problems at all. It's a soft-shooting dream and that ghost ring makes it perfect for putting all the rounds in minute-of-bad-guy. I like the thing so much it's my HD gun, being both handy, simple and potent but light enough and with gentle enough recoil that my wife can easily handle it.

Now comes the suck. As well as the 3 factory mags, it came with 4 20rd steel Pro Mags. They look just like the factory mags, but that's where the resemblance ends. They feed ONE round, the first. After that, each and every round in each and every mag nose dives into a jam. I tried loading 20, then 10, then 5 rounds into these darn things. No joy.

Here's the accursed things: http://www.promagindustries.com/Prod...uctCode=RUG-A8

Has ANYONE had any luck with these mags, or should I add them to the target box like every other Pro Mag I ever owned? I can't believe this company is still in business........

Oh yeah, here's the mandatory pic. I just wish I had the cash at the time to snap up the P94 and the other 3 factory mags that are glitched out of the pic (I did consider selling this little beauty before I fired it, but found the cash another way. Damn glad I did!)


Last edited by NCLivingBrit; 02-09-2010 at 21:22.
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Old 02-10-2010, 12:28   #2
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I owned a PC9 and purchased three of those Promag 20 rounders and never had a single problem.
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Old 02-16-2010, 08:27   #3
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Mec Gar makes excellent quality PC9 mags. Unfortunately, I don't see any for the PC4 on their website. I would avoid any Promags in the future. Good Luck.

Last edited by m1key; 02-16-2010 at 08:34.
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Old 03-21-2010, 08:27   #4
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you should notify ProMag of the problem. they do have a good warranty.
I have several ProMag's for 3 different chamberings, 2 different mags gave problems I could not 'tweak' out and upon calling ProMag they sent me a post=paid return authorization for replacements. one for a .32acp pistol (the replacement does fine) and another for 9mm S&W again the replacement did fine.
I had to 'tweak' some M30 mag feed lips a bit for good functioning by carefully compareing them to the factory mag. after the adjusting and smoothing they do fine.
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Old 10-18-2013, 14:58   #5
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Ammunition may be your issue. are you using soft points or lead range ammo or flat tops? i learned with my sks and p38, ammo and not the magazine can be the issue. try different kinds of ammo.

i use round FMJ and never had an issue.
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Old 10-24-2013, 06:49   #6
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I'm not positive but don't those little carbines use the same magazines as the Ruger pistols.

If I'm not correct please let me know for future reference.
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Old 01-15-2014, 06:34   #7
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Originally Posted by kctgb View Post
I'm not positive but don't those little carbines use the same magazines as the Ruger pistols.

If I'm not correct please let me know for future reference.
They use the older "P" series pistol magazines, but not the newer "SR" series ones.

I had a PC9 carbine, which worked well with both the normal capacity pistol mags, and with some aftermarket larger capacity ones I had. Unfortunately, I can't remember what brand the aftermarket 15-20-25 and 30 round ones were. - The main issue I had with some of the aftermarket mags was this: The cutout on the followers on a few of them, where the bolt hold-open lever contacts the follower after the last shot is fired, was dragging on the side of the lever enough to actuate the hold open feature when there was still one round left in the mag. It was nothing a small file couldn't fix though. Easy fix.

There were a couple of the aftermarket ones though, that had the same nose-tipping issue mentioned here. I ended up replacing the springs in those, and that cured the problem.
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Old 01-19-2014, 22:47   #8
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Unhappy Some need tweeking and persuading


So the problems we have had were feed lips and follower shape and design. Not all look and work like the Ruger OEM ones. Some need tweaking?
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Old 01-19-2014, 23:17   #9
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Originally Posted by theboonedockssaint View Post

So the problems we have had were feed lips and follower shape and design. Not all look and work like the Ruger OEM ones. Some need tweaking?
Some definitely need tweaking.
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Old 01-20-2014, 13:58   #10
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I my experience with nose diving I was told to load the magazine at close to full capacity and let it sit for 2 to 4 weeks loaded. I was told by a magazine manufacture the springs have to be broke in.

Al I can say is it worked for me.
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