Mil-spec vs. commercial

[GFO]

Well this may sound stupid, but what is the difference between Mil-spec and commercial? I want to order a Magpul stock for my Bushmaster lower and I notice Magpul offers both Mil-spec and commercial versions. What is the difference? Aren't most, if not all, AR's made to Mil-spec or am I missing something.
Thanks.

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[DirectDrive]

Well this may sound stupid, but what is the difference between Mil-spec and commercial? I want to order a Magpul stock for my Bushmaster lower and I notice Magpul offers both Mil-spec and commercial versions. What is the difference? Aren't most, if not all, AR's made to Mil-spec or am I missing something.
Thanks.

This is a good question....here you go:

http://img862.imageshack.us/i/buffertube2.jpg/

Amongst to top stock makers Mil Spec is more universally accepted (more choices) and for that reason I would go Mil Spec.
You can also argue that Mil Spec ensures better materials and manufacturing technique.

"Commercial" exists because it's easier/cheaper to manufacture.

 

[GFO]

Perfect answer, I now understand. Thank you.

 

[RallySoob]

too further answer your question...Most AR15's are of commercial grade these days. replace all the parts on your rifle with mil-spec parts as you can for optimal reliability and compatibility.

I learned this lesson years ago when I couldn't get my tango down vfg to fit on my new RRA CAR A4 rail because the vfg was made to mil-spec specifications like most if not all AR15 accessories and the YHM rail on the CAR A4 was commercial grade. Same goes for upper recievers and QD scope mounts.