Old thread revival. I got a BCM Gunfighter Mod 3 and it seems to work just fine.

I was quite surprised to see the "will not fit" remark on the back of the package since nothing on the Cheaper Than Dirt! web site indicated that there may be a compatibility issue.

I haven't shot the rifle with the handle installed as of yet but doing a trigger function check (installed a new trigger as well), he handle operated no better or worse than stock. Access is a lot better with the oversize latch button but otherwise, it operates no differently than OEM.