Metalform mags in my PCC

[Alvin]

Been using Metalform mags in my AR9 for the past 6 years(yes, I use a colt adapter..Hahn).  It's been very reliable over the years but in the past 12 months I'm getting a FTF jam at times.  Cartridge is coming out of mag at an angle, of course, but jams with the nose up and case not quite clearing the magazine.  Doesn't happen very often, just enough to screw up a stage or two in a match.  Tried various things....cleaned mags, scraped and cleaned the Hahn feed ramp,  changed the extractor tension..ect....but I'm still getting an occasional jam.  This gun has been flawless up to this point, but now I worry about it.  Using a JP Barrel, Taccom bolt, shorten up the stroke....Is there someone out there who "tunes" these mags like they do with SV mags and other hi-cap mags?  Perhaps changing mag springs?   I've been using a 135 grain RN bullet at 132 power factor since day one.

It wouldn't be so frustrating if the gun always had trouble...but like I said....it ran flawless for years.  Any advice is much appreciated!!  Thanks

[egd5]

My first guess is weak mag springs. But do you reload, have you checked your oal, maybe it has slightly lengthened?

[Tampa-XD45]

You're describing the exact scenario I ran into when I used the Colt mag platform.  It ran great for years and then started to have random FTF problems.  It's why I ultimately switched to a Glock mag PCC.  

 

I called Metalform in Rhode Island and got a bunch of replacement mag springs when I ran the Colt 32 round mags.  Here's the contact info: https://metalform.us/contact/

[Alvin]

Thank you for all the replies!!

[Dirty_J]

If you’ve been running this setup for years and haven’t changed mags springs.. that should be step 1.  

[laz2011]

I use Rock River Arms mags in my pcc the mags have a metal follower and slick finish . I would look at your magazine springs also check your follower see if it's damaged. 

[Alvin]

Should have replied back to this topic a month ago...sorry for those who were wondering what I found.  Bottom line was that the Hahn mag block needed some attention.  I swapped out the one I was using for a different Hahn mag block and everything went right back to working again.  I've shot four matches with it now and no FTF at all.  I also tried out a Macon Armory mag block(also the same one that KAW sells, it's made by the same shop) and it works great also, except for a little tight on some of the metalform mags.  Talked with the guys at Hahn and they have had some mag blocks that had been worn out(a complete surprise to me) but at a much higher round count that I had(15,000 rounds).  Mine was not worn out, but needed to be readjusted in the mag well, and I polished up the feed ramp a little with the dremel tool.  Good to go now.