CCI Primers are continuously tested and improved. As a result today's CCI primers are more sensitive, easier to seat and more compatible with progressive and automated loading equipment than ever before. CCI primers have earned their reputation due to rigid testing standards and the implementation of improvement processes. CCI primers incorporate modern non-corrosive and non-mercuric initiator mixes. CCI #41 Small Rifle Primers are designed for military-style semi-auto rifles that don't have firing pin retraction springs. These primers help reduce the chance of a "slam-fire" with sensitivities designed for these military-style rifles such as the AR-15 platform.These CCI Primers are ideal for 5.56x45 (.223 Remington) rounds.
CCI standard primers are remarkably clean-burning, leaving primer pockets cleaner and extending the time between pocket cleaning. That’s a huge benefit for progressive reloaders. They are more sensitive and easier to seat than older CCI primers, and engineered for smooth feeding in automated equipment.

They utilize modern non-corrosive and non-mercuric initiator mixes for the cleanest burn possible.