Hello all, I'm an sks/ak builder gone to the dark side... Just bought a brand new M&P 15 today. Haven't even fired it yet and I'm already thinking of stuff I should get

I was interested in the 22lr conversions, but I don't think I would want to swap the whole upper, nor do I have the $$ to do so.

Does anyone shoot one of these regularly with good results? Am I going to harm the bore by using .22 and then switching to .223? I am very meticulous with my firearms, especially with cleaning, so fouling and buildup would hardly be an issue.

I'm sure this subject has been beaten to death, but I appreciate any feedback or help from you folks.

pic of the animal in question...

and with little brother