Stay away from Sinclair version. I had one and it was terrible. But they have lifetime satisfaction so if you get it and have issued like I did you can send it back with no questions
Dolphin makes a bipod. I believe UK. Very uncommon.
The Duplin is only 17.5 oz, not nearly the heaviest F-TR bipod I've ever heard of by a long shot. Footprint width is not fixed either, it changes as the height is adjusted.
Respectfully, Mr. Holland I believe you may be thinking of the Remple bipod being very heavy. I believe it weighs in at near 4 lb vs the 17oz of the Duplin.the Duplin is far too heavy for a properly built FTR rig .