Hi Charging_handle! Although I'm relatively new to this site, I have been around AR's for quite awhile... I,ve learned more about ammo and function for these animals, in the last couple of weeks here, then I did in the last 30 years on my own! I now shoot only xm193, LC193, or Q3131A in my AR's, and my shooting buddies all shoot the same ammo as me now! So, you are most correct in you influence assumption about this forum! We shoot a lot..Federal & Win. should give you guys a performance bonus! I'm just happy to learn! Thanks for all! Till...later...GT