Chris, The Numrich 22 rf liner requires a feed ramp because it is inserted into the 30-06 barrel with the rear cone shaped breech. If you read my first post at the top, "install a rear extension to fit the M2 bolt" concerning the barrel liner. If you ever notice a SA M2 22rf barrel at a gunshow or anywhere else, there isn't any feed ramp such as the Numrich barrel. Notice the photo of the breech end of the barrel, that is the extension with the liner installed. RobertInformation
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