Another good question, although being non chromed it could easily be reamed to 5.56 if they are .223 and the user needed 5.56. Not a big deal there to me. Just more curious as to the reliability aspect with no chrome lining.
I suspect it's like the old you get what you pay for price wise but I'm not looking for a tack driver in 10.5 just something to build and play with that will go bang reliably without too much trouble.