Sigma05 Posted July 18, 2020 Share Posted July 18, 2020 I hate pistol grips on shotguns, but the M4 field stock is just too damn long. My plan is make my own grip to replace the one on the M4 collapsible stock. I’m going to try to copy the shape and angle of the Magpul SGA stock. I may even add a QD option. The million dollar question is: does anyone know the thread pattern on the M4 buffer tube, that the stock/grip threads onto? If anyone has that info I would greatly appreciate it. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 M8 x 1 Quote Link to comment Share on other sites More sharing options...
Sigma05 Posted July 18, 2020 Author Share Posted July 18, 2020 33 minutes ago, Vertigofirearms said: M8 x 1 That seems awfully small for the thread on the buffer tube that the stock/grip threads onto. The buffer tube alone is 20mm. Quote Link to comment Share on other sites More sharing options...
StrangerDanger Posted July 18, 2020 Share Posted July 18, 2020 Haven’t confirmed, but Vertigofirearms would know better than anyone! Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 Oh you mean that one. It is M21 x 1 -RH. it will have different fitments deprnding on the material 2 Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 This partial blueprint (for a prototype five position buffer tube) I drew up not too long ago might help you out a bit more. 3 Quote Link to comment Share on other sites More sharing options...
Sigma05 Posted July 18, 2020 Author Share Posted July 18, 2020 39 minutes ago, Vertigofirearms said: Oh you mean that one. It is M21 x 1 -RH. it will have different fitments deprnding on the material That seems like the correct one. It’s the thread where the stock or grip thread onto the buffer tube. Thanks!! Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 I thought you meant the thread size for this stud on the field/pistol grip stocks. I have no details about your idea, but you know you can buy a bare bones buffer tube from Benelli or Surecycle? The grip angle of the magpul SGA is too steep, it will not work with the buffer tube, something to keep in mind. Quote Link to comment Share on other sites More sharing options...
Sigma05 Posted July 18, 2020 Author Share Posted July 18, 2020 (edited) 1 hour ago, Vertigofirearms said: I thought you meant the thread size for this stud on the field/pistol grip stocks. I have no details about your idea, but you know you can buy a bare bones buffer tube from Benelli or Surecycle? The grip angle of the magpul SGA is too steep, it will not work with the buffer tube, something to keep in mind. You are correct about the whole SGA stock not fitting because of the angle. Even though Håkan Spuhr made his own angle adapter for the buffer tube and new bolt “tail” to work with a different angle. I don’t have those skills. What I want to do is grab only the grip portion of the collapsible stock and correct the grip angle to as close as possible to how the field/SGA stock sits. I needed to know the thread pattern because I may have to design and print my own grip. The other option is just modify the original grip module to fit a Magpul K grip at the angle I want. I already ordered a spare OEM grip to start experimenting. I appreciate the info. Edited July 18, 2020 by Sigma05 Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 Have you thought about cutting the stock shorter? Quote Link to comment Share on other sites More sharing options...
Sigma05 Posted July 18, 2020 Author Share Posted July 18, 2020 8 minutes ago, Vertigofirearms said: Have you thought about cutting the stock shorter? Yes. The plastic field stock didn’t seem like a simple solution. I even considered sending it off to a plastic expert like Tom Bostic. If there was a compatible wood stock that would be a much simpler solution. Have you ever successfully shortened the plastic field stock? Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 I have a first generation M3 with a shorten plastic pistol grip stock with limbsaver. Oh yeah I just remembered, you might be able to use a Stoeger compact stock in the M4 with the original buffer tube with some slight modification. You would need to make a 30mm (1-3/16”) counterbore. 1 Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 Shoot I might just order the stoeger stock myself and try myself? Quote Link to comment Share on other sites More sharing options...
Sigma05 Posted July 18, 2020 Author Share Posted July 18, 2020 I remember seeing the Stoeger stock and wondering if it was compatible. ? May go ahead and try it too. Quote Link to comment Share on other sites More sharing options...
Vertigofirearms Posted July 18, 2020 Share Posted July 18, 2020 Quote Link to comment Share on other sites More sharing options...
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