I have a pair of new in package Agency Arms magwells for sale. I ordered them for a pair of Gen 4s I was going to get and then found a really good deal on some Gen 3 pistols.
These are for use with the medium backstraps, that's the smaller size of either type included.
1) Gen 4 G17 magwell in black for medium backstraps
1) Gen 4 G19 magwell in black for medium backstraps
Price is $90 shipped to you for each or $175 if you want both. I accidentally left them in my work truck so I don't have any pics but I'll get some up 04/21.
Any questions at all send me an email, first "I'll take it" in the ad gets it. Please indicate which you're wanting.