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Hello. New AR-15 owner here with a quick question. I know the common knowledge is that .223 is always ok in a 5.56 barrel, but I'm wondering if that's ever not true. My FN15 (Magpul edition) has 5.56 marked on the barrel, and the manual specifically says not to shoot anything else in it, that .223 and 5.56 are not interchangeable. Am I missing anything? Aside from liability, or the 5.56 not technically being designed for firing the .223, are there any safety (for me or the gun) issues in using .223 in an FN15 5.56? Why would FN write that?

Tried searching first, but couldn't find this discussion...

Thanks all!
Maushunter
 

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Never Ever had an issue in my AR, FS2000, or SCAR16 with the .223 ammo.
 

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Hello. New AR-15 owner here with a quick question. I know the common knowledge is that .223 is always ok in a 5.56 barrel, but I'm wondering if that's ever not true. My FN15 (Magpul edition) has 5.56 marked on the barrel, and the manual specifically says not to shoot anything else in it, that .223 and 5.56 are not interchangeable. Am I missing anything? Aside from liability, or the 5.56 not technically being designed for firing the .223, are there any safety (for me or the gun) issues in using .223 in an FN15 5.56? Why would FN write that?

Tried searching first, but couldn't find this discussion...

Thanks all!
Maushunter

From what I understand:
.223 in 5.56 chamber = ok
5.56 in .223 chamber = no
 

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From what I understand:
.223 in 5.56 chamber = ok
5.56 in .223 chamber = no
Correct. regards to pressure that the 5.56 round produces. slight difference in dimensions of the chamber.

+ .223 Wylde = either
Correct. This is middle ground for the dimensions.
 

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The billet 7075-T651 upper & lower, 18" match grade free floating CHF chrome lined barrel, and built in ambi bolt release is what sold me on it. I'm hoping the advertised 1.5 MOA is a conservative estimate, since my SCAR 16 is grouping just under 2 MOA. I will find out this weekend.

 

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Selected the FN-15 20 inch of colt AR15A4....did I make the correct choice?
My dealer is able to get me almost any of the FN15's I would like, but said none of the distributors have any Colt AR's available.
 

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FN15 Tactical Carbine II

Bought my first AR15 recently and went with the FN15 Tactical Carbine II. Needing advice on what is a decent 5.56 round (preferably 1000 bulk) for training and practicing with the new gun. Finding its a pain to find any really but did find Winchester and PMC.
 

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