I bought this longer barrel from a member here on the forum. It is for my Winchester Defender 12 gauge. The shorter barrel has a knob or nut that holds it on (First Pic). However when I install the longer barrel the nut will not go down far enough to hold the barrel down (2nd Pic). Is there a spacer or something that goes on under the nut? Sorry if this is dumb but what am I missing? Thanks guys.





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