Here are the answers to your questions. If you need anything else, let me know.
Originally Posted By AN94NK:
Im looking into buying a parts kit but I have a few questions first.
I have my eyes on either the 16" CAR or the 16" Expedition
Are the receiver extensions Milspec or Commercial? Standard is commercial, but Mil-core is available for a $15 upgrade
Are the light weight barrels Gov profile or pencil style? Those are pencil style
I will be getting a flat top upper.. Is the fsb F marked or should I go with a railed fsb? We do offer F sight's for flattop uppers
If I go with a railed fsb are they properly pinned on the barrel or just installed with set screws? Nearly all rail gas blocks are installed with either set screws or in a clamping manner via screws. Our standard rail gas block attaches via set screws, but we do offer several different clamping styles as well. I haven't seen a pinned on rail gas block in many years. A few companies use cut down sight towers as gas blocks, but they don't have a rail provision on them.