Century C-15 Post ban rifles.
About 2000 were made in 1998.
Surplus M16A1 Parts assembled to forged and possibly cast receivers produced by Olympic Arms Inc.(both types of receivers may have been used for this build.)
Smith Enterprise compensators welded on in place of flash suppressors.
Bayonet lugs ground off.
Barrels are Colt, 1 in 12, chrome lined.
God only knows where they got the trigger parts used in the production.
The barrels and bolts stayed together during the addition of the compensators and the grinding of the lugs so if Colt did the headspace right then it is still right.
M16 bolt carriers were replaced with AR15 carriers by who we can only speculate since I have not personally handled and diassembled one of these rifles yet.
If Century didn't muck the muzzle chamfer when they welded the compensators in place, chances are these can be pretty decent general purpose rifles.
The other parts can be replaced for a moderate sum if they are questionable.
The information is provided by people who are paid to write this stuff down, thanks guys.HTH