I don't think that is correct at all.
So-called "featureless" rifles are still permitted to use detachable magazines. To be "featureless" a rifle must not have a pistol grip, a flash suppressor, a folding stock, a forward pistol grip, and maybe a couple more features that don't come to mind right now.
If you replace the pistol grip with a Monsterman Grip, remove the flash hider, and do without a collapsible or folding stock, then it is NOT an "assault weapon", a term invented to deprive people of their right to keep and bear some arms.
Sorry to be late on the reply. You are refencing the law prior to the passage of AB1135. This new law is summarized by the ILA as follows:
“Here’s a summary of Brown’s actions:
SIGNED BOTH- Assembly Bill 1135 and Senate Bill 880 would make changes of monumental scale to California’s firearm laws by reclassifying hundreds of thousands of legally owned semi-automatic rifles as “assault weapons.” This legislation effectively outlaws magazine locking devices, more commonly known as “bullet buttons”.These areconstitutionally protected firearms that have no association with crime. These changes would happen quickly with great individual costs to many gun owners and without public notice. Governor Brown vetoed similar legislation in 2013.”
The above is a little confusing, by referencing the “bullet button” which allowed AR pattern rifles, and others with detachable magazines absent some of the silly cosmetic “features” you reference to escape the draconian intent of the gun-ignorant legislators to ban all “scary black” rifles. The new language, while it does not remove the previous cosmetic feature list adds this:
“(b) For purposes of this section, “fixed magazine” means an ammunition feeding device contained in, or permanently attached to, a firearm in such a manner that the device cannot be removed without disassembly of the firearm action.”
This would cover your mini-14, your springfield M1A1 and other previously “california legal” rifles.
Yes, it’s that bad. Yes, the Cali legislature has gone that far off of the deep end.