Traditionally, there have been issues with using compensators (comps) on rifles that are used in military, police, and defensive roles. Comps tend to increase the blast that can be heard and felt by the shooter and those around them. This is a very bad thing for those working in team situations. Also, the blast from a comp can be deafening indoors. There have been several comps introduced in the last couple of years that minimize the noise that is directed to the shooter but are still quite loud to those around the shooter. This is an improvement but still isn’t ideal.
The Battle Comp from Battle Comp Enterprises claims to have changed all that and they have some pretty impressive reviews to back it up. They appear to have created a comp that can reduce flash to a level similar to the A2 flash suppressor and reduce muzzle flip greatly without increasing concussive blast to the shooter or those around the shooter. The decreased muzzle flip should will allow faster follow-up shots while the lack of blast increase makes this viable for military, police, and defensive use. This is an important advancement for AR-15 muzzle devices.