3rd Gen Custom RIA A2 HC 10mm / .40 S&W 16 Round Magazine
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These are high quality, high reliability magazines for Armscor Rock Island Armory (RIA) High Capacity 2011-style 10mm and .40 S&W pistols.  Specfically, these are for the A2 HC pistols that use the 16 round double stack magazines and are designed for smooth reliable feeding. They are not for the traditional 8-round 1911 pistols (I would recommend Wilson Combat or Tripp Cobras if you have one of those pistols and lots of websites carry one or the other).

These are custom made by starting with Mec-Gar P14-45 magazine tubes and we then modify the feed lips to properly retain and feed 10mm rounds.  Note, a normal P14 mag can’t securely retain a 10mm round because a .45 ACP case diameter is 0.4734" while 10mm measures 10.8mm (0.425") and .40 S&W measures 10.77mm (0.424").  What you tend to find is that a 10mm cartridge, which is what I shoot, can sit in a .45 ACP mag but it will pull out or even fall out of the magazine far too easily.  The feed lips must be adjusted to properly retain the 10mm & .40 S&W cartridges, which is exactly what we do.

These hand-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.  

Due to the modifications, these are compatible with Para Ordnance or "Para" style P16 magazines.  If you have a pistol that uses Para style magazines, these should work with them.  I would recommend searching the web to confirm if Para style mags work directly in your pistol or require modification. The mag lips are short so the round is not fully supported - RIA pistols do not require that for example.  If your model of pistol requires the cartridge to be fully supported, these will not work.

I am getting a couple of emails each day asking if I really have these magazines -- Yes, I really have these on-hand.

I recently wrote a blog post about why I think our mags are the best for the double stack 10mm & .40 S&W RIA pistols - click here - it has a lot of photos so you can see one of our mags next to an OEM mag.

These custom mags should work with Armscor RIA pistols that use the OEMP164015B FS A2 double stack magazine.  The RIA pistols that use these mags iinclude:

  • 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 specialized jig and process to bend the feedlips to properly retain and feed 10mm rounds to the ramped supported barrel that RIA uses in the above pistols.

Again, why buy our magazines?

  • Mec-Gar's quality is superb so we start with an excellent foundation to build on
  • They have hardened steel bodies and feed lips will hold up very well with extreme use
  • Mec-Gar developed a remarkable anti-friction coating that aids in feeding and even makes loading the magazine easier
  • The magazine spring is made from type “D” music wire and holds up nicely - I think it is far better than the original Para or RIA springs.
  • The polymer base plate that fits very nicely in the large RIA mag well funnels.  
  • The floor and baseplates lock into place and can't be knocked off easily as can happen with some of the "toolless" designs.
  • 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.

One small detail, since these were originally for .45 rounds, the mag round indicator count 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.

A fellow asked if I had made many magazines for the RIA pistols and I told him I have made and sold well over 700 at this point.  


After the mag lips are tuned, each magazine is tested in either my 10mm RIA 52009 or 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.  Buyers that are using these in both 10mm and .40 S&W pistols tell me they run without any changes needed.

3/10/22 Update:  We are now setting front feed lip gap between .370-.390 based on customer feedback.

I do have something I want every reader/buyer to remember:  PLEASE Always test the magazines before you need to rely on them - you must verify that a given combination of pistol, ammo and magazine are reliable and this is true for any firearm. My liability is limited to the purchase price of the magazine and they are warranted against manufacturing defects only (not including any required feed lip tuning) for 90 days. 

Do you have a brand new pistol?

A brand new RIA pistol will have feeding problems right out of the box because it does need to wear in and this may take 100-200 rounds.  When you get a new RIA pistol, be sure to clean and lube it.  I would then recommend cycling the slide a few hundred times (literally) to help smooth things out before you get to the range the first time.   It may still have some feeding problems after this but they will be a lot fewer.  By the way, the need to wear in or break in is very common in firearms so don't get discouraged right away.

Dawson Plates and Wolff Springs

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 sticks 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 not capacity.  Please click here if you are interested in Dawson plates.  To be clear, this magazine will work just fine with the base plate it comes with.

The Mec-Gar spring seems pretty robust and that is what I am personally running.  If you want an even stiffer spring, we do sell Wolff magazine springs that are 10% stronger than the originals. It does require a bit of shaping to fit the follower.   Please click here if you are interested.

Take Down Pin Bundle

You have an option to add one of our Full Length Guide Rod Take Down pins at a discounted price now if you are interested.


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) plus try to maintain a list of other areas. 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.

The following are the limits per state that we are aware of - and please email us if something has changed:

  • California: We can no longer sell magazines to California due to liability issues
  • Colorado: 15 rounds
  • Connecticut: 10 rounds
  • Delaware:  17 rounds
  • Hawaii: 10 rounds
  • Illinois: We will look up your city and county to see if you have limits.  For example, Chicago and Cook Country are limited to 10 rounds.  
  • Maryland: 10 rounds
  • Massachusetts: 10 rounds
  • New Jersey: 10 rounds
  • New York: 10 rounds
  • Oregon:  Measure 114 is temporarily restrained
  • Rhode Island:  10 rounds
  • Vermont - 15 rounds for pistols
  • Washington D.C.: 10 rounds
  • Washington State: 10 rounds

This product is export controlled by US Government Export Regulations.  We will not export to any country.

Terms and Limit of Liability

This is for one magazine - the pistol in the photos is not included.  We are not liable for any damage or injury resulting from use or misuse of this magazine.  The buyer assumes all liability.

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.

Customer feedback from emails:

4/9/22 "Just wanted to say thanks for an awesome product! The mags work perfectly and I dare say I like them better than the stock mags. I will definitely refer anyone I can to you in the future!! - JP

2/8/22 "The mags are solid.  Feeding is way more reliable now." - John

10/14/21 "The 2 mags worked great, only 1 mis-load of aluminum cased 200gr FMJ. The RIA magazine came apart on the bottom." - Mark

10/4/21  “I just wanted to let you know that the mags are flawless! The original mag I got with my RIA A2 had developed spring issues. Your mags are as smooth as butter. I will definitely be ordering more!” – Rick

10/3/21 “I purchased 3 of these to go along with the single mag my RIA 1911 a2 10mm came with. Overall the mags feel sturdier and of a higher quality than the original Mag the gun came with. I also have had 0 problems with feeding, clearing or spring retention and this was the only place I’ve been able to even find these magazines. Thankfully they turned out to be a great buy” -Will Eversole 

9/18/21 "I just ran 500 rounds of .40 through the 4 magazines without a single failure" - Tommy

9/10/21 "I thought for sure you were a scam and only bought one mag.  I was surprised when it showed up and worked great.  I just ordered three more." - Thomas

8/18/21 "Your 40/10mm magazine works perfectly on my Rock Island A2. Yours was the only magazine I could find for that firearm now and I am 100% happy that it fit and function just fine." – Kurt

8/18/21 "I purchased 2 mags and can say they are a good fit and work as well as the 1 factory original that came with my RIA 10mm 1911. I haven't been to the range yet but when working the slide they were flawless in loading and extracting both round nose and Hollow points. I will be ordering more." - Branko

"Thank you so much - I only got one mag with my FS HC and really wanted two.  Your mag works great!" -- Tom, Arlington, TX.

"I always want four mags for my pistols and could not find that RIA mag anywhere.  Your's is just as reliable as the one that came with my pistol." -- Steve, Madison, WI

"Wow - I thought you guys might be a rip off.  I got the mags and they run great.  I'll be back for more." -- asked that I not post his name.

"I was nervous when I got my mags and they said 14-.45 on them but they hold and feed my 10mm rounds really well.  I have no idea how you got those lips to bend so evenly."  -- Mark in Montana

"I took my four new mags to the range and they functioned flawlessly in my FS HC.  Thank you!"  -- D.S.

"Just got back from the range and the two mags worked great.  No problems with feeding or dropping freely from the pistol.  Thank you!" -- David W.

  • Item #: RIA10mmHiCap16Rnd3rdGen

3rd Gen Custom RIA A2 HC 10mm / .40 S&W 16 Round Magazine

Price: $44.99
2 or more: $43.99 each
4 or more: $42.99 each
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