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Tuning Mystery part, Where does it go? [solved, it's a charging-lever spacer]

Ozimek,

My Gen One Umarex Gauntlet has a similar looking piece that fills in a gap between the synthetic stock and the rear part of the action. It always surprises me, falling out, when removing the stock since none of my other PCPs have anything similar. Has no function other than gap filler. Check around stock for any unusual gaps you hadn't noticed before. Best of Luck, WM