3rd Gen Custom RIA 2011 10mm 16 Round High Cap Magazine
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This is our third generation of magazine for the Rock Island High Capacity 2011-style 10mm and .40 S&W pistols that use the 16 round magazines – they are not for the traditional 8-round 1911 pistols (I would recommend Wilsons or Tripp Cobras if you have one of those and lots of websites carry one or the other).

These are converted Mec-Gar Para P14-45 magazines that have the feedlips adjusted and fine tuned to properly retain and feed 10mm rounds.  Note, a normal P14 mag can’t securely retain a 10mm round.  These tuned mags will only work with 10mm and .40 S&W.  They will no longer feed .45 ACP correctly - just 10mm and .40.  Mec-Gar stamps "P14-.45" on them and I do not have a way to change that.

I am getting a couple of emails each day asking if I really have these magazines -- Yes, I really have these on-hand if the inventory says I have a certain number in inventory then that is what I have.  A lot of guys tell me they have been waiting months to get mags from other vendors.  That is not the case with us - I actually have these mags.

These custom mags should work with RIA pistols that use the OEMP164015B magazine including magazine including:

  • 51994 TAC Ultra MS 10mm
  • 51914 TAC Ultra FS 10mm
  • 56862 TAC Ultra Threaded 10mm
  • 52000 PRO Match Ultra 6" HC 10mm
  • 52009 Rock Ultra FS HC 10mm
  • 51738 Pro Match Ultra H - 40S&W - note, I tune for 10mm as I don't have a .40 so some minor adjustments might be needed.

The adjustment process and tooling took some work because Mec-Gar uses surprisingly resilient hardened steel magazine bodies and feed lips.  I had to develop a means to convert the magazines. Based on my past experience and some research, there are some really cool benefits from the Mec-Gar design:

  • Hardened steel bodies and feed lips will hold up very well with extreme use
  • Mec-Gar developed an anti-friction coating that aids in feeding
  • The magazine spring is made from type “D” music wire and holds up nicely
  • They developed a polymer base plate that fits very nicely in the large RIA mag well funnels
  • The slightly taller magazine body clears the RIA mag-well funnel very easily.  It’s longer than our previous generations of magazines and is even slightly longer than the original RIA/Act-Mag magazine
  • The magazine’s specified capacity is 16 rounds of 10mm.  It’s a tight fit but I can often fit 17 rounds in there but I can’t guarantee it

We do sell Dawson base plates if you wish to have one that extends further than the included Mec-Gar plate (the Mec-Gar plate fits fairly flush and is easy to insert and extract).  The +100 Dawson plate stickk out just about as far as the polymer plate so a +200 or +300 plate would actually make the magazine taller - note that the plates add height only but capacity.  Please click here if you are interested in Dawson plates.

The Mec-Gar spring seems pretty robust.  If you want an even stiffer spring, we do sell Wolff magazine springs that are 10% stronger than the originals.  Please click here if you are interested.

After the mag lips are tuned, each magazine is tested in both my 10mm RIA 52009 and 10mm 56282 pistols to ensure proper fit and feeding.  You may find some final tuning is needed on your particular pistol and it is easy to do – please click here for more information.

Please test the magazines before you need to rely on them. My liability is limited to the purchase price of the magazine and they are warranted against defects (not including any required feed lip tuning) for 90 days.

One small detail, since these were originally for .45 rounds, the mag round indicator counts doesn’t match since you will be loading either 10mm or .40 – usually you have one or two more rounds of 10mm/.40 compared to what the round count hole label says.

Due to irrational firearm hysteria, I will not ship magazines to locations listed in the USCCA magazine limit guide page that prohibit magazines of this size (16 rounds is my stated capacity). I will not ship disassembled "magazine kits" to those locations either - sorry. I can't export them either - I hate having to put all this legal stuff in but I must.  It is the buyer's responsibility to ensure compliance with all applicable laws and regulations before buying these magazines.

This is for one magazine - the pistol in the photos is not included.

Please do not use Paypal to purchase magazines.  We do take American Express, Master Card, and Visa so please use one of those methods.  Sorry - Paypal's policies do not allow for many firearms and parts transactions but we have quite a few pro-gun customers who do like to use them for other products we sell.

  • Item #: RIA10mmHiCap16Rnd3rdGen

3rd Gen Custom RIA 2011 10mm 16 Round High Cap Magazine

Price: $59.99
2 or more: $58.99 each
3 or more: $57.99 each
4 or more: $56.99 each
5 or more: $55.99 each
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