Using 8 round mags in Officer size frames

Discussion in '1911 Forum' started by Steve in Allentown, Jan 13, 2020.

  1. I wanted to run extended tube CMI Government length eight round magazines in Officer's size frames so I bought a couple of their SBP Extended Bumper Pads which Check-mate uses on their 10 round magazines to experiment with.

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    The next thing I did was disassemble a standard eight round mag, cover the bottom third of it with Dykem, lock it into an Officer's Model frame, and carefully use the bottom of the frame as a guide to mark its outline onto the magazine. Then I reassembled the mag and measured from the bottom of the mag pad up to the lines scribed into the Dykem and transferred those measurements to the new bumper pad. Here's a pic of the Dykem applied to the first mag. If you look closely, you can see a thin white line where I scribed the outline of the frame onto the mag.

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    After that it was a simple matter of cutting, filing, and sanding the polymer base pad until it allowed the eight round mag to seat into the Officer's frame. Now the eight round mags cannot be over-inserted, they run perfectly, and will be used as CCW spares on my belt.

    Below are some pics of a Colt CCO that I tweaked a few years ago and one of my favorites for CCW (new sights, trigger, grip safety, slide stop). This first pic shows it with a standard, flush fit six round mag in place.

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    Here it is with a standard eight round mag fully seated. You can see the problem I was attempting to solve with my experiment. Over-insertion is definitely a concern here.

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    Finally, here it is with the same eight round mag seated but with my homemade bumper installed. A perfect fit, if I do say so myself. Problem solved.

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    Below are three magazines so you can see the differences. Standard flush fit six round, standard eight round extended tube with standard bumper pad, and standard eight round extended tube with homemade bumper pad.

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    Below is what the SBP Extended Bumper Pad looked like before and after my surgery on it.

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    Every mag I have gets heavily used on the range and during IDPA matches. These are no different. In fact, the eight round mags that have these new base pads have already seen hundreds of rounds through them with no malfunctions.
     
  2. Fred_G

    Fred_G Well-Known Member

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  3. PaBushMan

    PaBushMan Well-Known Member

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    Good idea. I bought some 10 round mags for my FS 45 1911's.
     
  4. PeeJay1313

    PeeJay1313 Well-Known Member Supporter

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    More the merrier... As long as its reliable!!!!
     
  5. I recently modified ten more base pads so I could have more 8 round mags that would correctly fit compact frames like Officers and CCO pistols.

    Rather than measuring this time, I simply used one of the previously modified base pads to trace a line onto my next victim.

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    Cutting was faster using a sawzall blade by hand after first scribing along the line using a Dremel cut off wheel. The Dremel melted the plastic if held in place too long so I lightly cut a groove that would keep the sawzall blade lined up.
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    Here's a base pad with one side removed down to the scribe line. You can see the opposite side has been cut through also. All it needs now is a vertical cut to intersect the horizontal cut so that section can be removed. You can also see a cut at the front where the new front tab will be located.
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    Here are 10 base pads that have been "roughed in". At this point they've all been fit so that there is minimal clearance between all three contact areas on each of them them and the pistol frame. This is much stronger than just the single contact point at the cut out at the front of the frame common to all magazine manufacturers. You could pound a magazine into the frame with a ball peen hammer and these base pads would probably withstand the punishment much longer than any other method of preventing over-insertion.

    It took lots of filing and sanding to get to this point. The finishing touch of polishing the cut surfaces comes next.
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    Here are two pistol cases loaded up with standard 6 round mags and 8 round mags with their new base pads. One case is for a CCO while the other is for an Officer's Model.
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    towboater likes this.
  6. towboater

    towboater Well-Known Member

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  7. tinbucket

    tinbucket Well-Known Member

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    My Kimber Commander sized Stainless II ( back is locked and can't get up to get it or remember the name)has a seven round mag. The squared lower corner bites my hand. when firing. An extended 8 or nine round mag with a rubber bumper shaped to fit the contour of the mag well area would be great. Sorta llke the S&P mags on wife's .380 with an rest of sorts for the last digit. I just knew someone made one but no luck.
     
  8. tinbucket

    tinbucket Well-Known Member

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    I would like one on my Kimber Commander sized 1911 too. I have seen some with an extended mag formed to fit the bottom controur of the gun , but not a 1911, I don't think. I would allow at least one more round and stop the sharp edge of the rear of the grip digging into your hand and better little finger purchase on gripping.
     
  9. Wambli

    Wambli Well-Known Member

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    Funny I just tried to insert my 8 round magazines into two of my Kimber Ultras and they work fine and I can NOT over insert them. Never thought it would be an issue and I’ve been using 8 rounders as reloads when I carry my officer sized guns without issues for years...
     
  10. The picture below shows a flush fit 8 round mag on the left, two extended 8 round mags in the middle, and an extended 10 round mag on the right. Which one do your 8 round mags look most like?

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  11. Wambli

    Wambli Well-Known Member

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    All of the above. I run flush bottomed Kimber ProTacs and Chip McCormick Match flush mags and Wilson Combats and a few others with the plastic extended bottoms. I don’t have any 10 round mags for my 1911s. Anyway I tried both my Wilson and my Kimber and neither will go past where they are supposed to on my Kimber Ultras. I practice reloads with the 8 rounders all the time. Never knew it was an issue with some guns.
     
  12. Hookeye

    Hookeye Well-Known Member

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    The Commander sized Kimbers were called the "Pro Carry" IIRC. The all steel ones the "HD".
    I run a Colt Commander, w reg and bumper pad mags.
    During an IPSC stage I slapped the reg no pad mag in and zipped through, good score.
    Then noticed the blood all over. Yup I got the mag seated fine, chunked out some offending meat doing so on lower portion of hand.
    Oops.
    That SOB was sore as heck for quite a while after.
    Limited amount of mags, I might start w a no pad mag..........but any reloads are done w base pad mags.
    Might have mentioned it..........that friggin hand was SORE for a long while after.
    ;)
     
  13. So there's no contact between the bumper pads of the eight round mags normally used in full size frames and your compact frame pistols? My guess is that if Hookeye slapped one of these mags into one of your Ultras on an open slide during an IPSC match with his adrenaline levels going off the chart, he'd manage to push the feed lips past the ejector and jam up the pistol something awful.

    I've seen guys in IDPA matches do exactly this on a number of occasions. I've also seen folks unknowingly try to lock compact mags into full size frames and then proceed to beat on them trying lock them in place when the inevitable malfunction occurred.
     
  14. Hookeye

    Hookeye Well-Known Member

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    I have some 10 rounders I've run, no jams.
    Wilsons maybe?
    Reg flush fit mags are Colt, Wilson and Chip.
    Zero issues..........well except for the non bumper pad chew that one time LOL
    Hell I haven't bought mags for my 1911 in 20 yrs.
     
  15. Hookeye

    Hookeye Well-Known Member

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    Been a while, but bud had an Officers and ran reg length mags, thought he had a slide over on them