Wanted to add some extra weight to my impact, and while I was at it decided to add length and raise the bipod mounting location. 5/16 x 1-1/4 cold rolled steel plate bent/ welded to make this nifty little addition. It's bolted to the Anvil rail, and fit perfectly after I shaved off a little room for the bottle. It's also relocatable if I come across a little extra money for a 700cc bottle in the future.
