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"Stepped Plane Optics" On The M14.ca Blackfeather “RS” (Rifle System)."

http://www.m14.ca/articles/M14.ca_St...ane_Optics.pdf

This optics treatise discusses the advantages of the M14.ca CASM or CASM "EX" scope mount + M14.ca Scout Hand Guard on an "SPO-equipped" M14-type Blackfeather "RS" rifle.