Gun rights weren't lost in one fell swoop. Gun control has historically been instituted via incremental measures.
Likewise, gun rights won't be won back in one great and ecstatic act of wholesale repeal.
Politics simply doesn't work that way, and frankly, I'll happily take an incremental real-world victory over an imaginary wholesale one.
If tweaking the magazine ban to make it less repressive is all it takes for gun rights supporters to pack up and go home, shame on us, but such an argument still at least envisions a world where our gun rights are better off, if only by a bit, than they are now.