Can I get some advice on these? What's the best way to do one? I have heard it is advisable to have a notched hammer? Should I just put together an entire gun, or is it good enough to just use my standard AR lower? Is just dropping a conversion bolt in my existing upper good enough? I've dicked with other people's stuff in my gun and it worked OK, but, there seems to be other options, for which, I assume there is some benefit. Thanks.