Very cool ! I almost bought one a couple months ago and then decided I didn't want to mess with CO2, but kind of regret it now. why can't you bulk it? it has the internal threads, so you should be able to. I think only the older ones with the external threads are harder to do. I know some guys don't like modifying their guns, but I've ready that the CO2 sheridan rifles are greatly improved by more efficient valves. I would send that thing to Mac1 and have him put in his improved valve and the bulk fill adaptor and have a super sweet rifle ! Alas, this rifle has external threads for the fill cap and the vent hole is way down just in front of the stock. The Mac1 adapter is for guns with internal threads and vent hole closer to the muzzle. Still doable but, as I said, problematic. I love CO2 guns, have a whole herd of them!https://www.mac1airgunshop.com/sheridan-f-bulk-adapter-p/mshfbuad.htm
Showing off my latest acquisition, a Sheridan F model "CO2 Blue Streak". Been looking for one at a decent price, came across this one on an online auction and put in a bid. I figured someone would surely outbid me but darned if I wasn't the only bidder. I've done a little homework on these, read that they are gas hogs which is pretty much true. I get about 25 usable shots on a 12 gram cart. Very accurate, every bit as much so as my Sheridan pumper. From what I've read, shot count and consistency can be improved by lightening the hammer and hammer spring. I intend to do this but would like to hear from someone who has done it before. I was hoping I could convert this one to bulk fill but it is a variant that makes it a bit problematical. Still a mighty fun gun, I don't mind buying 12 gram carts.