Fun fact... With these lowers not having a laser etched "SA20" or "SA15.7", the specific model is unknown. I've asked Select Shooting Supply what model designation they have, and SSS says "none".
For any firearm to have an FRT, a make and model is required. Not saying this doesn't have an FRT, it certainly does. But without any specifics, the stripped semi auto CC lowers could foreseeably be one of any of the restricted semi auto variants that Colt Canada produces.
Why is this cool?
There are several AR15 based model designations produced by Colt Canada and Diemaco brands that are semi auto only with restricted classifications.
They are:
C7A1, C7A2, C7CT, C8 CSC SCC, C8A1, C8A2, C8CT, CQB, IUR, SA15.7, SA20, SFW, and the C10.
Yes, all of the above names are semi auto restricted. And not all of them were shipped from CC with any sort of model number associated.
Making these new, stripped lowers a pretty good start for a legit C8A2 or similar build.