It's a Para-Ordnance P12-45 and I love it. The perfect compliment to my P14. Shot it on Veteran's Day and it's accurate as hell... much better than I anticipated from a 3.5" barrel. Recoil wasn't nearly so bad as I expected either (230gr ball and JHPs).
Stock 12rd mag
http://www.mustangmods.com/data/152/p12a.jpg
P14 mag
http://www.mustangmods.com/data/152/p12b.jpg
P14 mag w/ 3rd extension
http://www.mustangmods.com/data/152/p12c.jpg
POS USA 20rd mag
Unless I can find a good Wolff spring for this puppy, it will be decoration only, but I knew that when I bought it.
http://www.mustangmods.com/data/152/p12d.jpg