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Auto Ordnance Thompson M1 - why is there grease in the stock ?

Discussion in 'Gunsmithing' started by bobmitchum, Feb 23, 2011.

  1. bobmitchum

    bobmitchum

    71
    1
    Sep 12, 2001
    Western US
    Just curious, as I was shortening the LOP on my semi M1 the other night, and the cavity in the stock was filled with cosmoline (?) grease ... not certain why as it doesn't appear there is anything mechanical back there.
    Checked on another M1, and same thing - stuffed with grease.
    Anyone know why this was done ?
    Thanks, as always.:dunno: