If restricted status is a big turn off I would say to get a RobArms XCR.
They are more expensive but reasonable considering the cost of a base AR15 then add in flip up sights and a continuous (monolithic) rail and you can end up paying a lot more. The only thing I wish they had was a stock that both folds and collapses but then it would be restricted. It also takes all the picatinny rail accessories they AR15 can.
I agree with greentips that it would be better to buy a complete rifle then making your own right off the bat.
If you want a heavy contour (full auto rated) barrel look to CMMG, Questar has them at decent prices. One note while heavy barrels heat up slower they also cool slower than lighter barrels. If you also plan on adding accessories your rifle will only get heavier, keep that in mind.
A stock that both folds and collapses has nothing to do with the classification of a rifle. If said setup reduces the OAL to below the limit then its an issue. The design itself is not.
As for heavy barrel contours being FA rated. That's just wrong. The gov't profile is far from being a heavy barrel/contour and many a soldier(as well as others) run them FA without an issue. The only result most will see from a heavy barrel, is a heavy rifle. If you shoot from the bench its a non issue. If you compete or train its a major issue.
TDC




















































