You do realize that's not a telescopic stock, right? That's a slide-fire stock - a very specific product to replicate automatic fire. I can't think of a single violent crime committed with that. In addition, it uses a technique similar to bump firing to work, but bump firing in itself is different. It is entirely a gimmick, and I don't really care if I can persuade you or not. You're already set in your hatred of guns, and despite having limited knowledge of firearms, refuse to listen to those who have experience. My hope is to help educate people who have been victim of the tremendous amount of misinformation out there and are willing to listen to the other side with an open mind. I've used the bump-fire technique only for fun, not because it's a super effective way of shooting the gun. Even if you handed me a select-fire assault rifle to fight against a group of attackers, I would still use primarily the semi-automatic setting. It's simply the more accurate and more effective way of shooting the rifle. I don't understand why this is so hard for you to grasp.
If you have a problem with that specific slide-fire stock, then fine. But don't use that as a reason to ban AR-15 rifles or high-capacity magazines. You still fail to point to a study showing that a restriction on high-capacity magazines has reduced crime. There are plenty of places in the US with this policy already in effect.
I love the argument "my home is a gun free zone and we haven't had any crimes happen here." Well, good. Converse to your argument, my home has plenty of guns. I, too, haven't had any violent crimes.
You'd better put up a sign saying that there are no guns allowed in there, just in case a potential home invader doesn't know. It's common sense that someone (or people) who intend on breaking and entering your home are going to make sure follow your no-gun rule. Right? Similar to how a potential school shooter is going to think, "I was going to shoot this place up, but because of the no-gun policy, I guess I'll just go home." History has clearly shown that to be true...