Hello Gents, Im in need of a bore sighter for use inside my shop. Im a custom rifle builder and customers keep bringing in there scopes for me to mount. My shop is on main street and I live in gun hating California. Bringing rifles outside to boresight the traditional method is not possible. I would probably offend somebody feelings if not scare the hell out of them. What have you found to be the best one to encompass most calibers. Thanks in advance.