thanks HighPlanesDrifter that upper is finally together. its got a m16-a1 barrel 1:12 twist (my spare barrel want to find one more for a backup). RRA chrome plated BCG. the lower is the same lower i use for my 458 socom upper and my olympic 45acp upper. i havent shot it yet and wont be able to until spring. front sight post is from dpms and is .050 round style. mycolt sp1 can retire after over 20 years of use. its just to hard to replace and has a lot of sentimental value to me. triangle handguards one has a small couple of surface marks the plastic isnt scored. chrome bcg from rra for shihan, yes i have a bayonet for it!!