I bought this used from Dennis Todd in PA (he's a well-known source for Colt parts). It's a factory colt take-off collapsible stock and two position buffer tube, along with the castle nut and receiver plate (as pictured below).
As this was a take-off from a Colt factory firearm, the castle nut and receiver plate show evidence of staking (light dents to prevent loosening).
The two position buffer tube is a dark Colt grey with typical linear marks from stock extension and retraction and a few small dings.
The stock is "N" marked under the release handle and is in excellent shape (no apparent dings or nicks).
I will throw in the rubber butt pad in the picture for free.
Price is $60 delivered in the lower 48. Payment by paypal (+3%) or postal money order.
Email with any questions: firstname.lastname@example.org