Just a heads up: Aim has these for $95 and free shipping which is a good deal considering they are $100 elsewhere, however, as of right now on Aim's website the part numbers for the compact and standard frame magwells appear to be switched.
I ordered a product description PF940C POLYMER80 PF-Series Magwell for Polymer80 COMPACT Frames which currently corresponds to part number XP80CPMWSBLK on Aim's website. Based on the description I thought I was getting a magwell for the G19 sized frame, however I received one for the G22 sized frame and it does not fit correctly.
The standard frame magwell currently shows a part number XP80CPMWCBLK on Aim's website.
Logically I would think that the part number with S after W would go with the standard frame and the one with the C after the W would be the compact, but those are reversed as of now and I think that's why I got the wrong thing.
I've done an RA, but Aim's policy is for the customer to pay for return shipping. I've asked for a shipping label since I was not at fault for the need to return the item, so we'll see how that goes.