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This was posted on another board and I asked 555th via email if it was okay to post here. Figured you all would want to see this too.
Here is what was posted:
"I built a flat bending jig last night and bent up 3 tapco reciever flats. [edit for item about pictures that didn't pertain to this board]...I basically made the jig to the dimensions of the inside of a reciever, made in 4 pieces so you can get it out of the reciever after the bends are made , bolted a flat piece of metal underneath to hold the mag well and and bent away. for the top rails, I heated them with a torch while it was still in the jig and tapped them over with a hammer and then quinched the in water to get the hardness. I've been thinking of how to make a good jig and I think this one will do great, I'll try to improve it by making the rail bends first with another jig instead of having to use a torch."
"The "block" is in 4 pieces 2 1/4" pieces on the sides and 2 3/8" pieces in the center, which add up to 1.25" . The 1/4" side pieces have cut-out for the dimples and the center 3/8" pieces have cout-out for the magwell lip.. The front of the block is 1.15" and the rear id 1.60" and is 10.25" long. with tabs on the ends to hold them together. bolts go through the center of the 2 3/8" plates to attach the bottom plate under the flat. This keeps the magwell from pulling out during the bend. After the bend just unbolt it and slide the 2 center pieces out and the 2 sides will be able to come off of the dimples. It does a neat job."
Here is what was posted:
"I built a flat bending jig last night and bent up 3 tapco reciever flats. [edit for item about pictures that didn't pertain to this board]...I basically made the jig to the dimensions of the inside of a reciever, made in 4 pieces so you can get it out of the reciever after the bends are made , bolted a flat piece of metal underneath to hold the mag well and and bent away. for the top rails, I heated them with a torch while it was still in the jig and tapped them over with a hammer and then quinched the in water to get the hardness. I've been thinking of how to make a good jig and I think this one will do great, I'll try to improve it by making the rail bends first with another jig instead of having to use a torch."
"The "block" is in 4 pieces 2 1/4" pieces on the sides and 2 3/8" pieces in the center, which add up to 1.25" . The 1/4" side pieces have cut-out for the dimples and the center 3/8" pieces have cout-out for the magwell lip.. The front of the block is 1.15" and the rear id 1.60" and is 10.25" long. with tabs on the ends to hold them together. bolts go through the center of the 2 3/8" plates to attach the bottom plate under the flat. This keeps the magwell from pulling out during the bend. After the bend just unbolt it and slide the 2 center pieces out and the 2 sides will be able to come off of the dimples. It does a neat job."