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I'm looking at converting my polytech is why I'm asking. I'm looking to scale it down some for hunting. I go through lots of brush and woods obstacles. I'm wanting essentially a Bush rifle like Springfield armory used to sell. Not going the scout mount way though. I'm well aware of the minor velocity loss, shorter sighting plane. I'm not proficient at shooting irons to 800 yds, don't plan to be, though I can shoot them fine at shorter ranges. It will get scoped in traditional manner with either a 7 or 10x max scope.
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Your plan is solid.
Both of my 18.0" MK14s were built by SEI on Norinco receivers that I supplied. Awesome rifles.
I recommend a standard weight barrel for your build, this will keep the weight down.
Since you will rely on an optic, I would suggest a GLFS made for the 18.0", the GLFS-H-18 is the lightest.
Use the DC Vortex or a Good Iron brake that further reduces the OAL.
The CASM from M14.ca is an excellent, light weight scope mount that is worth consideration.
Scope, rings, and cheek riser are an entirely different can of worms
Good luck.