Same bolt and thicker barrel as the S. I had trouble getting the breech bolt nut to stay put on my Challenger carbine. It would loosen right back up. Had to put a little blue locktite on it. The carbine cocks much easier than an HW99. Handsome gun. I ruined the poor thing's history by replacing the chipped up stock with one I refinished. Repainted the back blockOriginally Posted by johnbaz
The Challenger had a nice setup too at the breech block, A flush slotted nut, Nicer looking than the German products!, Not sure if it's the same as the Mercury S as I don't have one for comparison, I've an Airsporter S but they don't have them!
John..
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