ProMag 10rd Long Mag Conversion Help....
- Thread starter thunder835
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theturtleman
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I did all 3 of mine today in bout 10min tops. I only left about a 1/4 inch. U only need a ltlbit to hold the spring. Works great. 
OP
thunder835
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Just got my 2 10 rounders in tonight. I cut the first one down to just over 1.5 inches and was able to get in 31 rounds.
EDIT
**I can confirm the magic number is 1.25" from the bottom of the follower. This will give you a 32 round magazine.**
I didn't have a scroll saw so I made a mark at 1.25" and took some wire snips and slowly cut in from the edges. Then I sanded it down to make it smooth and then reassembled. Pretty easy to do.
If you have any questions let me know.
AWESOME!!!! This is what we were looking for! Now, can't wait to get the mags so I can modify them. Thank You soooo much!!
I can squeeze in 33, 32 comfortably. My photo shows the length of the standard production 32 round spacer, I made mine to match at .5 inch.
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thunder835
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Went to the range today. My converted Promag worked perfectly.
Thanks for the update! I am still waiting on the 5 that I ordered.
AustinWolv
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Tested 4 modified mags myself yesterday and they ran great!
Full mag dumps, locked back with authority, very pleased with the mags so far.
For those that like video: Easy, quick.
Full mag dumps, locked back with authority, very pleased with the mags so far.
For those that like video: Easy, quick.
diesel43078
Member
Just modified the two 10 rounders that came UPS today. Took about 20 minutes total to do them both. It really was super easy. I cut and contoured the limiter to 1.25" and can squeeze 33 rounds in each mag. Can't wait to test these puppies out!
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coleslaw
Member
I had some 10 rounders show up today. I cut and and shaped the spring blades on the followers to 1 3/4". This allows 30 rounds to be loaded, doesn't fully compress the spring and the mag locks in on a closed bolt fine. I'm satisfied with that.
Just cut mine down to just under 2" and can get 30 rounds in them. They function just fine in my 15-22. Overall length is a little longer than the S&Ws but for off hand shooting you do not notice it.
buddyleewv
Member
Mine came in today I cheated a little and used a Drexel tool took about 5 min to do all 3 I cut them at 1 3/8" and rounded the edges loads 32 rounds perfectly will try out at the range this weekend
Got my 4, 10 rounders in today. What type of bit did you use?
AustinWolv
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Found my snips, so it was even faster doing another 3 mags last night than what was shown in the video.
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buddyleewv
Member
I just used side cutters to cut them straight across the used the sanding drum to round them off they are perfect like the stock end but they work
I didn't bother to round mine off, and it still works.
RED ZMAN
Member
Got all three of mine in today, after measuring a bit and some calculations, i cut and filed to the exact size to hold the spring and the floor latch. Fits 33 rounds with a bit of slack, almost 34.
I took a bunch of pictures showing all the measurements and each step, should I post up a step by step Do It Yourself guide?
Sent from my Transformer TF101 using Tapatalk 2
I took a bunch of pictures showing all the measurements and each step, should I post up a step by step Do It Yourself guide?
Sent from my Transformer TF101 using Tapatalk 2
thejuiceman
Member
Red ZMan,
Did you post this yet. If so can you put a link here?
Thanks!
Did you post this yet. If so can you put a link here?
Thanks!
acropora
Member
just got my two 10 round long promags today 10 minutes later they now hold 32 rounds.i cut off all but 1 3/8" like the video link above stated and it worked perfectly.so nice to have 3 magazines now rather than the one i had to deal with for months.it kind of sucked going to shoot 1000 rounds last weekend and only having one mag to work with.
10 minutes later they now hold 32 rounds.i cut off all but 1 3/8" like the video link above stated and it worked perfectly.so nice to have 3 magazines now rather than the one i had to deal with for months.it kind of sucked going to shoot 1000 rounds last weekend and only having one mag to work with.
