Eightbore, I stand corrected. After your comment, I called my brother to see what guns we were looking at. His DH is an 0 frame 16 and the Trojan was an 0 frame "20 ga." thus the 0 frame. We swapped the barrels and they easily fit on both frames. I find the Trojan frame unattractive. Has anyone come across a custom Trojan? One that has had the frame altered like they do on the Fox SW's. Thanks for the comments, I always thought Parker created a lower quality gun with different internal configuration. Learn something new every day. I might have looked differently at 16ga. Trojans in the past when looking for a 16 ga. field gun. Randy