AR Owners: Know Your Chambering

[Phil3]

I know the topic of 223 Remington vs 5.56 has been discussed endlessly, but just wanted to remind AR owners they should be absolutely certain of what chambering they have before loading it up with 223 or 5.56 military.

I built my AR and ordered a barrel from Krieger. I told them I would be shooting 223 only and wanted the absolute best accuracy. Krieger used a specific reamer to achieve that and as I recall, was instructed never use 5.56 ammo. I recently called them and they researched their records and found my barrel serial number. They said that barrel was reamed to minimum 223 Remington SAAMI specs and should absolutely not be used with 5.56 ammo.

Rifles are sold and bought all the time, and I think it wise to be absolutely sure what is safe to fire in it and what is not. 5.56 may not be safe.

Phil

 

[DogPatch06]

The topic no longer needs to be discussed endlessly. The facts are here:
http://www.luckygunner.com/labs/5-56-vs-223/

Not a short read, but you get the idea.

 

[butchlambert]

A very good article. Like a lot of gunrange BS. I use both in my AR with a Wylde chamber and have no troubles. Mine is a Shilen CM barrel though.

 

[Hammerhead]

I got the 223 Wylde. Covers both cartridges.

Tim