AR-15 Olympic Arms Chamber - Civilian or Military Specs?

P

PSE

CGN Ultra frequent flyer
I have an Olympic Arms upper obtained in the mid 90s and I was wondering if this has the military or the civilian chamber dimensions. I have shot both military and civilian brands of ammo through it with no issues at all but with all this talk of the differences between both I am curious as to what the dimensions actually are. There are no markings on the barrel or receiver to indicate specific caliber.

Also would the Armalite uppers be civilian chamber dimensions or are they military??
 
I forgot to add that the Olympic Arms upper was purchased from Wolverine.
 
I think the difference between military and civilian could easely be know by the twist. If it's 1/7 it's military it can shoot tracer and heavy bullet compared to 1/9 it can only shoot light bullet.
 
pedja said:
I think the difference between military and civilian could easely be know by the twist. If it's 1/7 it's military it can shoot tracer and heavy bullet compared to 1/9 it can only shoot light bullet.
Click to expand...

Good point - I think it might just be a 1 in 9 twist - That rings a bell. In that case it probably is civilian chambering
 
olympic are normally 5.56 chambers, no matter what twist if the barrel is stainless it will be 5.56
 
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