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Join Date: Dec 2012
Location: Susquehanna Valley
These are not all inclusive, but looking at known "brand" forging marks, the LK means an FN upper, forged by Kaiser Aluminum.
CAF Colt / Alcoa Forge
CH Colt / Harvey Aluminum (1st Colt Forgings)
CM Colt / Martin Marietta
DK Diemaco / Kaiser
FK, FS, BK, DK, EK, FK, AF, CW, AA, FS Bushmaster
LK FN / Kaiser
LM LAR / Martin Marietta (Army Spares Contract)
Splintered A - Olympic Arms
Check closely forward of the front sight, and also back towards the delta ring on the barrel. Sometimes the markings are faint after coating. IT should at least give caliber and twist, if not a 2-digit manufacturer.
"The trouble with our liberal friends is not that they're ignorant: It's just that they know so much that isn't so." - Ronald Reagan
Last edited by Retired_Rusty; 01-10-2018 at 07:09 PM.