Need AR specialists to answer a question

[Goofyfoot2001]

I don't own an AR but do own a 3d printer. Made this for a buddy but it is really tight at the buffer tube. He could sand it or I could re-print it but wondering what he would need to change out the buffer for a Mil-Spec which I think I found was a few millimeters smaller in diameter. Like what's the cheapest he could do this for and where?

 

[Burt Gummer]

Easiest would be to try a different buffer tube. Someone here will probably have an extra. Or look somewhere like midway USA

 

[Goofyfoot2001]

That's my question. Can he just get a different tube? Do you need other stuff with it, spring etc. Does the smaller mil-spec fit the threads, etc etc.

 

[Catfish]

A cheap mil-spec replacement is a $20 item and will drop-in fit all existing parts except the stock you removed. If that castle nut is staked he might wish to purchase a new one because the old one may need to be buggered up a bit to remove it.

https://www.midwayusa.com/product/5...mil-spec-diameter-ar-15-lr-308-aluminum-matte

 

[Get Off My Lawn]

Per Mission First:
Mil Spec size 1.148" diameter
Commercial spec size 1.17" diameter
I believe the interior dimensions are the same.

 

[blewis3]

Where did you get the stl for that?