I would hope that you would be able to use a pistol grip on your semi auto rifle, but I think that the DOJ would tell you that a bullet button would be required. The modification is cheap and easy.
There are many people with bad backs that (with doctors' permission), do not have to wear seat belts in a vehicle. A different restraint system would be prohibitively expensive for them.
I love California, but I am afraid of its government.
Those who choose safety over freedom are neither safe or free!
"The more corrupt the state, the more numerous the laws." (Tacitus, Roman historian 55-117 A.D.)
It is not the function of the government to keep the citizen from falling into error; it is the function of the citizen to keep the government from falling into error. - U.S. Supreme Court Justice Robert H. Jackson