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Posted: 8/14/2004 11:03:53 AM EDT
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Hello all..this is my first post.. As a complete noob to rifles and having just purchased an AR15, I just read the Primer article on this site. Towards the end it states about not having any oil in the chamber or bore area or you could have a "hydraulic failure". Can someone either explain what exactly happens and what causes this to be a problem or point me somewhere that explains it? I took it to the range this morning and just using the iron sights, I had a lot of fun. Started at 25 yards to dial in the sights..at 50 yards I had about a 2.5" group w/ a couple flyers. At 100 yards, the group was only 3" wide, but was a good 7" high. I have to work on where exactly I should be putting the tiny dot of a taget in the sight picture... Thanks and sorry this is so newbie. -Mike |
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Welcome to the board first of all and congrats on your new AR. First thing is to go to the downloads section of this site and get a copy of the M16 operators manual/-10. As for the no oil in the chamber and bore...The reason that is stated is if there is oil pooled up in the bore it could cause a restriction in the bore when a bullet is fired.This could cause the pressure to increase dramatically and could lead to damage such as a ringed barrel etc.. The way I apply oil to my bore and chamber is I soak a patch with FP-10 CLP and run it through the bore a few passes.Then I take a dry patch andf run it through the bore to remove any excess.This leaves a very thin coat of oil in the chamber and bore for protection. As for the sight in,I prefer the U.S.M.C. 25 meter battle sight detail as is found in the -10 manual. Raymond |
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The problem with leaving any liquids in the bore or chamber of a rifle is that it can cause pressure spikes and/or can even bulge the barrel. I have seen some rifles with bulged barrels due to too much cleaning solvent left in the bore upon firing. Go back to your high school physics. Liquids do not compress at least not to any degree that gases can. Therefore when you apply a sudden force to the liquid in a bore or chamber, the liquid has to go somewhere and can cause a hydraulic bulge along with a sudden pressure increase. Picture this. Two milk jugs, one with nothing in it and the other filled with water. Screw on the tops and then shoot each one with a rifle, caliber does not matter. The one that is empty will just have a hole going in and one going out and not much more will happen. The one filled with water will explode violently since the water cannot compress as the air does in the other jug. Get the picture? |
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Then in that case this is really a general warning with any firearm. The way they article is written, I took it as you cant even have an oil film on the bore or the thing is going to blow up in your face. As a newbie to the AR I wanted to be safe, not sorry.... I don't think I ever leave enough oil behind to be a problem when cleaning my firearms.. Thanks for the replies. -Mike |
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