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Posted: 12/25/2014 3:22:59 AM EDT
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This is my first post here! I just got my AR15 its a relatively budget set up starting with a Sig Sauer M400 Hunter.
Now what id like to do is free float the MOE stuff with a RRA NM free float tube. I've seen a few be done, i know ill have to use the dremel to remove some materal. I'm comfortable with this. Ive read however that the NM tube adds over a pound to the rifle. Again this is something I'm comfortable with as its mostly going to be shot at targets with the occasional hunt. Now my real question, I'm an engineering student and with that I have access to some pretty sweet software for stress analysis. So, I dont have the NM tube yet because I'd like to see how much material I can safely remove from it. If someone has a NM tube could you grab a few dimensions for me? I'm looking for the length from the barrel nut to the end where the hand guards attach, wall thickness of the tube, width of the gas tube slot, and length of the gas tube slot, and finally an OD of the tube. with just some very rough estimates of those dimensions from pictures Ive taken about 6 oz off of the tube without effecting the stresses a whole lot but id like to get some more accurate data. Pictures and data will be provided! Matt |
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There are a lot better ways to do this - but I suspect as an engineering student - part of this is going to just be the fun of seeing if you can do it, and how much you can do, rather than just throwing money at it.
In that case, I can not help you too much with dimensions or engineering suggestions - but I can offer that others have done similar things before: 
~Augee |
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I was going to suggest you drill the heck out of it to lighten it up.
If you hunt and actually carry it over any distance, you seriously do not want to lug anything more than you need too... Being an engineering student, maybe you have access to some sweet power / smart tools to help you remove the excess metal to lighten the load! BIGGER_HAMMER 
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Quoted:
Teeth of barrel nut to endcap: 11.875" Wall thickness: approx. 0.070" (sorry, couldn't fit my calipers) Gas tube slot width: 0.430" Gas tube slot length (measured to endcap): 4.75" OD: 1.385" sweet, ill throw those in my creo model.... the stresses are going to drop even lower! Matt |
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Quoted:
I was going to suggest you drill the heck out of it to lighten it up. If you hunt and actually carry it over any distance, you seriously do not want to lug anything more than you need too... Being an engineering student, maybe you have access to some sweet power / smart tools to help you remove the excess metal to lighten the load! BIGGER_HAMMER
Especially since I'm the lab manager at University of Houston! Bridgeport here I come! Matt |
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