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Beeman/FWB/Weihrauch part.NOTE: This mainspring is identical to part# BNP-9048 as far as OD and metal strength goes, however, this spring has 31 coils, compared to the R9 (BNP-9048) spring which has 34.As a result, this spring produces a little less energy and it will make the R9 shoot smoother and cock easier.

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