Thanks, but I have decided I will go with the BOSS-CR (meaning I will get the BOSS package which includes both muzzle brake and conventional recoil but only equip the conventional recoil.) I don't mind the extra length, and without the holes, keeping it clean will be easier. I found a great article on the subject here:
http://www.chuckhawks.com/muzzle_brakes.htm
Apparently the noise from the muzzle brake is deafening even with earmuffs.