Scroll up to post #5 and zoom. It was hard to get a picture. I tried two good fitting screwdrivers to unscrew the fill port but it was gorilla tight and I didn't want to marr the slots so I quit. Did those green gas bottles make any real pressure? Seems like it would be kind of anemic. I even pulled the butt pad just in case it held a surprise but nothing.If it uses green gas, there will be a tiny nipple type valve down in the fill port that looks like this.
You may need to shine a light down into port to see it-
View attachment 393772
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