bigedp51
FroggyOne2 said:Slam fires in an AR, is caused by a high primer.
Sorry BUT thats not the complete answer
Slam Fire: The M16 Story
http://www.fulton-armory.com/faqs/AR-FAQs/SlamFire3.htm

*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential.
And WHY CCI makes the #41 primer.
http://www.cci-ammunition.com/products/primers/primers.aspx?id=30