You're exactly right. the sleeve, ridges, locking lugs, and aligning them to go back in. However, if you push in the red safety tab at the end of the bolt, with the bolt extracted in your hand, the bolt turns to an angle that no matter how you line up the above ,it is off angle and can not be put back in until it is somehow released that allows the safety tab to come back out . Any one no how to do it?