IMO an AR with a fixed magazine is useless; what's the point? FYI, at
tenpercentfirearms.com one place they sell the MonsterMan grip is the following quote:
. . .Is the MonsterMan Grip CA DOJ approved? Of course not. The manufacturer attempted to get CA DOJ approval, but was he told that it was up to the 58 DAs in the State of California to determine the legality of the MonsterMan Grip. As a result the maker of MonsterMan Grip makes no claim that this device is California legal nor can he be held responsible for its misuse. . .
My three AR-15's are all "on-list" weapons so the lower receiver alone constitutes an assault rifle, let alone all the "evil features". Nahh, if it comes down to me needing something for HD, I'll use a 12 ga pump, the only evil features come out the barrel 9 at a time.