FrankSquid, thx for the reply. I didn't think there was anything questionable with the link I posted because it was largely an educational site dealing with legal to own NFA items.
I do understand how you could be hesitant or cautious though knowing the source/history of the old webpage where some of those diagrams in question came from.
It was a judgement call but heck, I figured you would have recognized quarterbore's webpage and figured it was sterilized :)
I gotta say, the lightning link is a pretty novel approach as far as design goes. That's the only reason why I posted the link really so that those who wanted to know what they were could get a bit of understanding of how they function.
Anyhow, so long as the educational discussion is allowed to continue that's all I care about. Having a good knowledge of the NFA rules and regulation is definitely advisable for anyone who's interested in such toys and I really think it's part of this site's mission to help people increase their understanding.
That said, I can TOTALLY understand where your coming from with regards to posting of plans, instructions, or other information on how to manufacture/modify firearms in a non-legal manner.
Catch you later, I'm off to lunch.