The Mr. 2nd Amendmentrecommended method of Lubricating an AR15 rifle. The method shown here was used in the AR15 Field Reliability video, found here:

   • AR15 Field Reliability Test  

Overall mindset:

keep it simple and minimal. Having a basic mechanical understanding of how the parts work and interface with each other will help you understand why "overlubing" is not the preferred method for an AR15. Overlubing will lead to dripping or wet parts, which are dust/dirt magnets. Often times AR15 owners who overlubricate don't know it's a problem because the AR15 will still function even with too much oil it only becomes a problem when the rifle is taken outdoors, in the field, or exposed to dirty/dusty situations.