Guys, I finally went to the dark (actually, black) side and got a Colt 6920LE. With components being hard to find, I bought a box of Remington 6 1/2 primers from a fellow Bullseye shooter. But Remington, on their website, says they are not suitable for use in a .223. I have seen conflicting opinions about flame cutting bolts, blown out primers, and on the other side of the coin, they are fine if pressures are kept below 55000 CUP, "I've used them for years", yada yada yada. So, can I use them in my sweet new M-4 or not? If not, can I use them in pistol rounds? Yikes, I don't want to hurt my Colt!