The basic is field-stripping, where you take the rifle apart well enough to clean it. Cleaning is important.
ar15 Detailed strip
This article is an excerpt from Gunsmithing The AR The hammer should not fall. If you see some fouling acumulating in the bolt recesses, like the extractor groove, around the ejector, or down in the fire control group, it might be a good time to really break things down. His bullets were traveling further forward, getting less of a spike, and thus shorted on velocity.
Step 2: Clearing and Safety Checking the Rifle
Reply 1 year ago. Inspect the bolt. A new barrel is not like changing the oil in a car.