According to the last time this topic came up, they said no. Most of us wish they would though. Best suggestion I had seen was getting your Bushmaster from www.ar15.tv
. they are a Bushmaster dealer, and they also were carrying the KKF brakes. They are usually pretty cool about getting you the rifle you want in the configuration you want. drop them a line and see if you can buy the Bushmaster you want from them with the KKF brake installed.