Call (479) 646-4210 ext 7 to place orders. The part number is 652006-1 for the block. Don't order the screws, washers, or o-rings from them. They are a few bucks each for those parts, so it adds up quick.
I made a few recently.Saw one on eBay also.https://www.ebay.com/itm/crosman-2240-drop-block-READY-TO-INSTALL/174719982259?hash=item28ae1f5ab3:g:WEEAAOSwCkJf9Mah
If you're trying to do it on the cheap, contact Umarex and see if you can get a Gauntlet tank block...if they have stock. It's essentially a QB tank block with the fasteners moved further from the end of the tube for better safety margin. Copied from member UCChris:QuoteCall (479) 646-4210 ext 7 to place orders. The part number is 652006-1 for the block. Don't order the screws, washers, or o-rings from them. They are a few bucks each for those parts, so it adds up quick.If memory serves, it's under $20. Way less than other options.
If you strike out, are not in a hurry, and willing to pay a livable wage... we can talk. Shelved these and moved on to other things when a fellow told me they were only worth what a QB block was...$35 at the time. Have been considering digging back in and finishing them, but I cannot compete with $20 from Umarex.Al