I haven't had a 14.5" shipped to me personally, but that shouldn't be a problem. The completed rifle shorter than 16" would need a tax stamp, but LMT should be able to send you just the barrel. Yes if you're building a regular config rifle, the flash hider should be pinned or welded or otherwise permanently attached for a total length of 16".
There are a lot of options for barrels, and it ultimately depends on what you want to do with the rifle, Wilson midlenght 16" is what I use and I couldn't be happier.
LMT and RRA should marry up, but some have said that the tolerances for RRA is very tight and sometimes they don't fit so easily... might ask PackerfanXD about that.
Hope that helps.
Cheers,
There are a lot of options for barrels, and it ultimately depends on what you want to do with the rifle, Wilson midlenght 16" is what I use and I couldn't be happier.
LMT and RRA should marry up, but some have said that the tolerances for RRA is very tight and sometimes they don't fit so easily... might ask PackerfanXD about that.
Hope that helps.
Cheers,