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M3 9mm kit


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#1 huggytree

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Posted 13 November 2020 - 05:29 PM

https://www.gunbroke.../item/883619007

Is it legit 1944-45. Or is it a repro ?

Condition looks too good to me. Especially the bolt
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#2 M17ap

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Posted 13 November 2020 - 06:05 PM

Loader and mag well adapter not original. He adjusted post to mention mag well not Be original or some type of field modification . It be nice to own and have dual caliber GG .They were made for both models.

Never purchased one of these kits because I heard they are problematic. They don’t always drop in and run. Frank I. Had a kit years back did an article on It had to move barrel in collar and double up front plate to get to be reliable.

 


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#3 Got Uzi

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Posted 13 November 2020 - 10:30 PM

They can be made to work but it takes some knowledge. Im gonna be watching this as I have an original magwell insert in my parts collection....I might have to make a pass at this. Timing sucks as im going to look at a house Monday....
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#4 Frank Iannamico

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Posted 14 November 2020 - 08:52 AM

I had one for an M3A1, the only one I had ever seen. Lots 'o' feeding problems. Despite the barrel being set back, the cartridges were too far from the barrel. Lots of "nose dives."

I did fix the problem by setting back the barrel a little further, and adding a second front plate to keep the bolt from hitting the barrel.

 

As someone mentioned above, I did write an article on the "fix" but I could not find it in the SAR article archives.

 

Someone made me a very generous $ offer for the kit that I couldn't refuse.

 

https://www.smallarm...idarticles=2990

 

https://www.smallarm...idarticles=1759

 


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#5 huggytree

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Posted 14 November 2020 - 09:47 AM

https://m.youtube.co...h?v=o9_GF7zvf-Q

Kit looks just as jumpy as the .45
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#6 StrangeRanger

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Posted 14 November 2020 - 10:02 AM

Is the 9mm bolt appreciably lighter than the .45 bolt or do they have about the same mass?


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#7 huggytree

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Posted 14 November 2020 - 12:21 PM

Uses the same springs as .45. So its gotta be less mass

Looks like the jumpiest 9mm Ive seen

Id say its the least smooth .45 but the rock seems timed with the next round. So your always on target. Wonder if the 9mm is similarly timed.
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#8 Got Uzi

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Posted 14 November 2020 - 02:07 PM

The 9mm bolt is roughly 3/8 to 1/2 shorter than the 45 bolt. Same OD, same guide rod springs and so on. The fact that its a little shorter lends itself to the reduced weight so the 9mm has enough ass to propel the bolt back far enough so it can sear up
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#9 StrangeRanger

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Posted 14 November 2020 - 04:23 PM

So there's less recoil energy being input by firing the cartridges and a lower ratio of the reciprocating mass of the bolt to the total mass of the gun.  So why does the tail wag the dog like that?


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#10 Mongo

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Posted 14 November 2020 - 04:33 PM

Because he is not shoulder the gun in the video


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#11 Blanksguy

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Posted 15 November 2020 - 10:06 PM

I guess "John-in-IN" and another "Bidder" are going after this tonight........


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#12 b_san

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Posted 16 November 2020 - 11:43 AM

Looking through his GB feedback, John just got a new toy and wants some accessories...
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