Reloading: Reloaders - Use Milspec #41 Primers for AR 15's and the 223/5.56/300 Blackout Ammo
To prevent accidental slam-fires with the AR15's - use the #41 Primers over CCI 400 Small Rifle Primers. I have been teaching my students what is stated in the Lyman manuals. #41 Primers are Milspec industry standards. This is all due to the AR15 floating firing pin. My friend has personally witnessed two slam-fires in his lifetime. One resulted in an amputation of a finger and the other one just a damaged gun/magazine. I found the photo that he sent me. Just ow!