What barrel is this?

[llaw99]

Can someone please identify this barrel for me? If you have one for sale, please let me know as well! Thank you.

http://img520.imageshack.us/img520/7076/magpistol1.jpg

[wimag]

armson

[Ando]

Yep. PTP makes them. You might still be able to get one from them if the forums fail ya.