pillar material...does al alloy expand enought to be an issue ?

[rsmithsr]

I have done several rifles with al alloy pillars, but my last couple were done with
glass rod ( fiber).
anyone ever check look into the expansion of an al alloy pillar ??

 

[Al Nyhus]

Here 'ya go. Fairly basic calcs but it gets you in the ball park:

https://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html

https://www.physicsclassroom.com/getattachment/reasoning/thermalphysics/src20.pdf