I am starting a new build next week. With all the hoopla surrounding the death of UBL, I though I would make the theme of the build around the gun that was used to bring Bin Ladin to justice. My goal is to make one as close as legally possible configuration wise for $1500-$2000. Looking at HK website, their semi-auto version goes for $3295, so I believe it is entirely do-able. Some of the specific details of the configuration are not available, but I think I have enough to go on. Here will be some characteristics of the build: 1. Monolithic upper 2. Piston gas system 3. Adjustable buttstock 4. 16" barrel (I believe the Seals use a 14", but I don't want to fool with the ATF over a few inches) 7. Be able to reliably fire brass, steel, or blank ammo without fail. My premise is you can build a very high quality AR that will hold up with the best in reliability without being in debt for the rest of your life.