Hi yall, I purchased a C308 about a year ago and began to wonder while in a state of annoyance, "...Why not see about putting a "push pin" lower housing on this thing"...(dun-Dun DUN!!)...well, I have read many a thread and forum on the subject of removing the semi shelf and opening up the pin holes with mixed reviews on this touchy subject that body slams it into the proverbial "grey area" of legality...So, I managed to pick the brains of two ATF agents that came into the gunshop (to which I am employed) to run a trace on a handgun, and (after showing them my personal C308, removing the lower and pointing out and explaining exactly what i desire to do in detail), both agreed that they saw no illegal action in doing such, as long as I kept the semi-auto trigger pack installed, and that the only thing they could think of is that I would have to prove, if confronted with any doubt by law enforcement, that I do not have a full auto trigger pack installed (unless I have a registered sear and the appropriate papers proving legal ownership). I know some will think "Jack, you just answered your own question...", true, but when a new agent or agents come into the area, they can carry ideas completely opposite of their predecessors. Now, with that long background stated, I am here to ask and get opinions on this. And by opinions, I mean what have yall have heard on the subject? Understanding, that I am not seeking legal advice in any way, shape or form on these forums. Basically just wondering if any of yall on here have done this or looked into this and actually received a response from the ATF "technologies division" on this subject? Also, Just as a crazy idea, Do yall think that it would work if the shelf remained on, but had the sides ground down to accept the pinned lower? Sorry for writing a short novel on this, just wanted to make sure I had all bases covered to try and answer any future question regarding this one. Many thanks in advance-Jack the Jackass.