[BlazingAngel01]

I stocked up on S.H.T.F ammo for my AR-15. my question is will i have pressure problems going form the 5.56 (55 gr) to the 223 (45 gr)? i looked it up and it some say its ok and some say NO. so what is it.........?

[rcmodel]

If your AR-15 has a 5.56mm chamber it will safely shoot anything.

If it has a .223 chamber, like on some of the heavy-barrel Varmint & Target AR's, you should not shoot Mil-Spec 5.56 in it due to the higher pressure.

Either the lower receiver, or the barrel, or both, should be clearly marked with which chamber you have.

http://i81.photobucket.com/albums/j219/rcmodel/KTOG/1224.gif
rcmodel