early parts

[RCS]

Just some different parts that are rather early to the AR-15/M16 rifle

The steel gas tube is not common to find and the only one that I ever found

nothing is repro

[Jersey Devil]

Are those front sight posts milled? I don't see a casting line on the front edge.

[RCS]

I know the second front sight base is milled, photo from my three digit Colt SP1 has the same milled front sight base. I believe all the early three digit SP1 rifles had it.

Also think the early cast front sight base was manufactured and finished without any casting marks