Tuning Seneca Eagle Claw .25 and slugs

A couple of issues. Pellets are supposed to be loaded skirt first ,backwards from the front of the magazine. If they are loaded nose first from the rear their skirts are sized down through the smaller diameter shoulder area of the mag designed to keep the pellets from falling back into the action. Early magazines did not have an o ring to help retain the pellets. Later mags were upgraded with the o ring to help secure the pellet in place and the magazine loading instructions were printed on the magazine.

If the gun is cocked with the muzzle pointing up, when the probe is fully retracted there is room for slugs or sized down pellets to slide back out of the magazine and into the action. Slugs or pellets falling into the action can jam the probe or even work their way down into the hammer tube where they can affect striker impact on the valve stem.
 
Here what I did for the slugs to slangily fit in the mags

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WY-

Those are Sumatra mags pictured. The question was about the rather new Eagle Claw. It has a box style magazine spring loaded, self-indexing. Later upgraded EC mags did add the central oring like you pictured, I presume to help with the slug situation. Slugs lack the oversize skirt pellets have so any proper size slug in theory could go through the same size hole the pellet probe goes through. A design compromise is the magazine oring tension is slight to allow pellets to be loaded skirt first without snagging. Then if you load slugs, point the muzzle skyward and jar the gun jacking the underlever gravity wins.
 
I took a number three Phillips tip and placed it into the rear of the magazine on each hole making four little things sticking toward the center. Now the slugs don't fall backwards into the mechanism. It was a very simple thing to do but a little tricky getting the magazine put back together after modifying all 10 holes on a 22. The spring that whines the magazine has little tiny holes that it goes into that are really going to test your patience. You need to be as steady as a surgeon. So I ordered two extra magazines and did one of the brand new ones and one of the old ones and that works very well. I got it all put back together and now another pellet has managed to play into the cocking mechanism so I'm going to do the remaining two magazines so I don't have to take that little side cover off and clean it out every week! The next thing is to get some punches with numbers and heat them up just enough to Brand each cylinder with a number so I know how many shots I have left. If you did some shooting and then you put the gun down and you came back later on you may not remember how many shots you took and there's no indicator anywhere on the magazine to let you know your balance. Kind of sucks when you go to shoot and it just goes click very softly