I think there are plenty of folks, like myself, that are pro-gun but anti-assault rifle, or at least anti- guns-in-public-life.
There is a basis for the second amendment, and that is a defense against tyranny, but that means we're talking about civil war levels of resistance. In that scenario, I think it really doesn't matter whether you're using an AR-15 or a M1 Garand, because there will need to be literally millions of people with these weapons.
I think many of us quietly support gun rights for the type of weapon that can be used in a civil war in mass, but can also be opposed to the type of weapon that supports a high capacity magazine that lets one nutjob kill dozens and dozens of people without ever having to reload or giving people a chance to flee. I also would prefer to live in a society where guns need to be locked and separated from the ammo, so that anyone with a visible gun in public can be immediately detained.