I purchased an MP15-22 in January 2017. Since then I have run approximately 800 rounds through it. If I don't clean the gun each time I have extraction/feed problems with the spent casing being stuck in the ejection port.

I am using CCI mini mag and a new CCI brand I found called CCI AR Tactical. Both types are 40gr. The AR Tactical is supposed to be specifically designed for the MP15-22.

Is this gun really so sensitive that it requires cleaning after 100 rounds have been shot through it?