Mags for AR-9: ASC or Metalform?

[Uni-Vibe]

I have a Colt Ar6951 9mm carbine incoming. I will use it for home defense.

32 round magazines. Do I get the $32 Metalforms, or the $16 ASC with orange followers?

Anybody with recent real world experience?

[wanderson]

Factory Colt mags are Metalform and IMHO the best quality.
I only run metalforms.

[chilidawg]

I have ASC and though I had 8 stoppages towardsthe end of the shooting session, I don't believe they are attributed to magazines. The gun was very dirty and the lube was drying up. My magazine well insert is a cheap plastic promag and this is the breaking in period. I recommend them.

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[RHINOWSO]

ASC may run or it may not - they seemed to have some manufacturing tolerance issues when I owned 6 of them and some wouldn't lock back my 9MM AR - when the Metalform mags (20/32rd) worked great.

I sold off the ASC and kept the Metalform.

Great thing about 9MM AR mags is they make a decent club if you are outta ammo.

[CleverNickname]

I had some C-Products mags for my AR9 and they ran 99%. I got some Brownells mags as a replacement and they ran 99.5%. I got some Metalforms to replace those and they run 100%.

[Uni-Vibe]

Thanks for the advice. Metalform it will be.

[john armond]

The PSA branded 9mm AR mags are manufactured by Metalform with the PSA logo on the base plate (item #504368) . I have several PSA mags and have never had a problem with them. C-Products and the Pro-Mag plastic ones always seemed to have issues. Watch for sales on the PSA ones, when they are actually in stock. I think at one time they were selling for something around $10-12 each if you bought 10 or more.

[Bret]

The PSA branded 9mm AR mags are manufactured by Metalform with the PSA logo on the base plate (item #504368) . I have several PSA mags and have never had a problem with them. C-Products and the Pro-Mag plastic ones always seemed to have issues. Watch for sales on the PSA ones, when they are actually in stock. I think at one time they were selling for something around $10-12 each if you bought 10 or more.

+1 to all this. I bought a load of them when they were available for $10 each. I still have plenty that are NIW, but all that I've tried have been 100% in my Colt 9mm SBR and my RRA 9mm SBR. Oddly, I have one plastic Promag and it's been 100% too. BTW, the RRA 9mm SBR was unreliable with the C-Products magazines, but has been 100% with the Metalforms.

[wanderson]

+1 to all this. I bought a load of them when they were available for $10 each. I still have plenty that are NIW, but all that I've tried have been 100% in my Colt 9mm SBR and my RRA 9mm SBR. Oddly, I have one plastic Promag and it's been 100% too. BTW, the RRA 9mm SBR was unreliable with the C-Products magazines, but has been 100% with the Metalforms.

I think that may be because if your RRA 9mm was like mine, it has no feed cone, just a chamber that completely supports the round. Great for hot loads as it’s got maximum case support, but if there’s any issue with the feed angle, it’s a malfunction. So having a good mag feeding at the correct angle is important. Usually feed cones are more important with Glock builds since they can’t feed as low as Colt pattern mags. Personally, I like max case support in case of an OOB and tend to save the NATO and +p loads for my AR9s.

[wanderson]

+1 to all this. I bought a load of them when they were available for $10 each. I still have plenty that are NIW, but all that I've tried have been 100% in my Colt 9mm SBR and my RRA 9mm SBR. Oddly, I have one plastic Promag and it's been 100% too. BTW, the RRA 9mm SBR was unreliable with the C-Products magazines, but has been 100% with the Metalforms.

I think that may be because if your RRA 9mm was like mine, it has no feed cone, just a chamber that completely supports the round. Great for hot loads as it’s got maximum case support, but if there’s any issue with the feed angle, it’s a malfunction. So having a good mag feeding at the correct angle is important. Usually feed cones are more important with Glock builds since they can’t feed as low as Colt pattern mags. Personally, I like max case support in case of an OOB and tend to save the NATO and +p loads for my AR9s.