ZEV 17 gen 4 has a restricted parent record in the FRT so the frame only is restricted. (FRN 171282)
А Glock 19 frame only can be restricted or prohib depending on generation. There are over a dozen different FRNs.
Taurus TX has a restricted parent record FRN 195740 so you _should_ be able to import a stripped frame
Otherwise read here for some examples of frame only guns that are prohib :
https://www.canadiangunnutz.com/for...7-Stripped-pistol-frame-was-deemed-prohibited
I would suggest going with Prophet River instead of IRG. Simply because IRG can tell you they will import something then say "oops" we actually can't and won't refund your fee. Do you have a gunsmith lined up here in Canada for the work? If not you will still get better options in the US. I'd ask on a Taurus forum for references.