Could you epoxy it on? Position it and hold it with some hose clamps till dry? Just thinkin'
That or you might see if they make a foregrip for your shotgun with the rails built in. I know they do for the 500 and 870.I know I've seen them somewhere, can't remember where. They make a 3 sided tactical rail that attaches to the barrel on a shotgun with clamps. I WOULD NOT weld it, you could create a weak spot, or warp the barrel causing it to explode. :shock:
Linkage: 3-RAIL PICATINNY SHOTGUN MOUNT at Brownells
Yea, but you could Silver Solder or braze it in about 5 minutes ... That's how the rib is held to the barrelYou guys can flame all you want, but that can probably be welded ...with a great big BUT. Your average welder could not pull it off. An extremely exceptional welder could with the right equipment and a proper procedure developed through trial and error. Barret welds their barrels with zero defects, although this type of barrel is a completely different animal. I would not do it in my shop....the liability alone would be a killer.
What it would take is a Pulsed TIG machine. No other machine would be able to run it correctly and control the heat enough. IMPO, a transformer machine would not be able to pull it off sufficiently. IMO, it would take an inverter unit that can cycle the pulses much faster than the transformer units could ever do. That pulse is how you control the heat....without it, you will damage the barrel. This fact pushes the welding out of the reach of most due to machine cost. That type of unit will start in the $4k range.( No, the cheap Chi-com units couldn't do it.) Even with that type of unit, only an ultra-experienced hand would be able to pull it off. Just having the machine doesn't mean you can run them correctly. I see this all the time. The machine is smarter than the weldor. Those units have a very steep learning curve.
Bottom line, get a clamp on model and save yourself the hassle.