I have a Merkel 1620 which is their 16 ga. built on a 20 ga. frame. I've had it now for the second full season. It's choked IC/Mod and has a 28" barrel. I would not trade or sell it. It's a boxlock, with very nice wood and fine wood-to-metal fit. In the fall of 2003, I shot 29 wild roosters and 26 ducks with it.
For the season just ended here, it was the best one I ever had---47 wild roosters and 25 ducks. The gun's LOP is about 13 7/8" and it fits like a glove; points naturally. I have since shouldered SKB's and the like, and now they feel like clubs.....I bought it at Scheel's All Sports in Iowa City for about $3,700.
The price was a tough nut to crack---but it's the best shotgun I ever owned.