If the problem your having with the amazon parts is the screw don't line up with the holes in the handguards, you have the wrong part. The holes in the handguards are spaced different depending on the length. I did the same thing with some from Cabela's and had to get the other size.
Si vis pacem, parati para bellum
"Any man who thinks he can be happy and prosperous by letting the Government take care of him; better take a closer look at the American Indian."