Field stripping is easy, BUT replacing/repairing the slide release, the spring is difficult to install, and the Sear/Hammerblock are both tensioned by the same spring, located under the ejector, that has to slip into this little channel, OR you aren't tensioning the sear, this is one of the most common problems with the gun, so if you know what it is, and you have a gun with sear trouble (anything from trigger issues like DAO to it going FA)
You can literally fix it with a $2 part and an hour of work, all you need is a third hand and the patience of Mother Teresa.