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re: Sig MCX won't eject

Posted on 10/23/17 at 2:29 pm to
Posted by jbgleason
Bailed out of BTR to God's Country
Member since Mar 2012
18928 posts
Posted on 10/23/17 at 2:29 pm to
quote:

Don't ever do this with ANY AR-type rifle, or semi-autos in general. An AR will run reliably bone dry if assembled correctly with the right parts, dumping oil on it only masks the problem and can result in catastrophic bolt failure.


This is SO wrong. Just so so wrong.

LINK

Don't take my word for it, here is a link from Larry Vickers. Love or hate the guy but he does know some stuff about the AR platform. I also was told (in-person) by Reed Knight, Sr. that the AR platform is best run wet. That guy DEFINITELY knows what he is talking about.

BTW, how the hell would lubrication cause a "catastrophic bolt failure"? I am really curious to hear that one.
Posted by CrusaderInfidel
Tishomingo
Member since Feb 2015
248 posts
Posted on 10/23/17 at 5:55 pm to
Man you are correct; the one thing an AR platform DOESNT like is going dry!!! That’s pure unadulterated phooey. They are designed to be scuba’d up and swam with and the worst environment for them is the sandbox when they overheat with no lube.
Posted by Clames
Member since Oct 2010
16635 posts
Posted on 10/23/17 at 5:59 pm to
I don't give a sailing shite what you or Vickers thinks. Neither you, him, or Reed Knight have seen the research conducted with instrumented rifles to measure and characterize bolt-face forces while these rifles are firing. The research was conducted specifically to find out what happens when these rifles are over-lubricated and nothing good comes from the practice. It's actually common sense why these rifles (any firarm except some protype Garands actually) aren't supposed to be run wet, that excess oil gets into the chamber, that interferes with how the brass "grips" the chamber as it obdurates during the firing phase. That grip transfers most of the rearward force of the cartridge case to the chamber instead of the bolt-face. Oil away that grip and the bolt goes from seeing somewhat less than 3,000lbf to nearly 6,000lbf. You just explain to me what you think is beneficial about that and how it impacts the fatigue life of the bolt. In combat, a wet rifle with the potential to have a bolt fail is one thing, that extra force allows the rifle to keep cycling even full of grit. Acceptable risk when considering what happens when facing incoming fire and no way to return it. None of you are running these rifles on two-way ranges though, not even Vickers these days. Lubricate according to the -10, there's a good reason why the Army explains exactly how much oil and where.
Posted by Clockwatcher68
Youngsville
Member since May 2006
6912 posts
Posted on 10/23/17 at 8:00 pm to
quote:

This is SO wrong. Just so so wrong. LINK Don't take my word for it, here is a link from Larry Vickers. Love or hate the guy but he does know some stuff about the AR platform. I also was told (in-person) by Reed Knight, Sr. that the AR platform is best run wet. That guy DEFINITELY knows what he is talking about. BTW, how the hell would lubrication cause a "catastrophic bolt failure"? I am really curious to hear that one.


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