RainbowBob,
It is possible to load any magazine incorrectly. If it feels wrong, it probably is wrong. Each round should lay flat and neat atop the other. While you do need to make sure any preservative applied by the factory is removed and the weapon properly lubed for best functioning, double feeds have only one source- the magazine. The magazine is bad, or the rounds are not loaded correctly. If the round isn't flat in the mag and firmly pushed to the rear so the bullet nose does not catch the edge of the mag when pushed down, there will be problems. If the bullets are inserted so they nose up, you will get double feeds.
As far a lubrication goes, a light coat of oil on the outside of the BCG (Bolt Carrier Group, or what your OM calls "bolt carrier assembly") and a few drops of oil into the carrier through the two vent holes is a good place to start. It is better to use a few drops too many than too few and experience will teach you how much you need to use.
Here are some threads to help you-
The following post is a good one, but a little on the overkill side. Use your best judgement
http://www.m4carbine.net/showthread.php?t=35490
It shows the use of cotton swabs appropriately, but never EVER use cotton swabs to clean out the gas tube. If the cotton comes off and gets stuck in teh tube, you'll be hating life. I've been shooting ARs for some years and have never used or needed a cotton swab for anything. Use common sense and keep your cleaning regimen simple
http://www.m4carbine.net/showthread.php?t=79448
AR MYTHS TO WATCH OUT FOR
While over-gassing is a real problem, it is not the source of all malfunctions. No matter what problem a shooter is having with their AR, someone will be along to blame it on over-gassing, even those over-gassing could not possibly induce.
Another myth is that the AR does not have a piston and operates by direct impingement. The fact is, the bolt of the AR is it's gas piston and Eugene Stoner states in his original patent application that the gas system is not a gas impingement system. If you want further references, let me know.
The BCG is not exposed to high temperature gases. By the time the gases reach the expansion chamber of the BCG, they have cooled quite a bit and pressures have dropped dramatically. You can test this for yourself- fire enough rounds at a steady pace until the gas block is too hot to touch, then immediately break open the action and extract the BCG. It will be barely warm enough to notice in most cases. The gas key might be a bit hot to the touch, however.
The gas pressure in the BCG does not push the bolt forward to assist in unlocking. To do so, the pressure in the BCG would have to be higher than the pressure in the chamber & bore. Anyone with even the simplest understanding of physics can see this is impossible.
Another myth is that the AR is not reliable or durable. History has proven this to be clearly untrue. Not only does the AR run reliably, it does so with less weight than most other rifles.
The AR is NOT a weapon's platform. Aircraft, tanks, vehicles, tripods, turrets and the like are weapon's platforms. The AR is a rifle, carbine, firearm, small arm, weapon......
There is nothing wrong with a rifle that needs a little attention. All forearms need some kind of preventive maintenance. Anyone who thinks otherwise is a fool. The AR does not need any kind of special or unusual care. In fact, it's needed PM is less than some very successful battle arms
Congratulations on your new rifle. With a little learning and some experience, you'll soon have your problems ironed out