So the title says it all. Im buying my first ar (im a ak guy but want a ar) and have it narrowed it down to a few offerings; LMT CQB MRP ($1800, DI not piston), Ruger sr556 ($1750), LWRC M6A2 SPR ($2200), and a POF 415 ($1850). this rifle is going to be a fighting rifle and it SHOULD be my one...