I do. The lip or forward edge of the buffer tube is supposed to be going over the buffer retainer. That's what holds the retainer into place. If you put another retainer in there right now, it'll just pop back out again.
The buffer tube should be screwed in so that the foward edge partially covers the retainer. The castle nut should be staked to the end plate so that buffer tube cannot back out and release the retainer.
When you do reinstall that retainer, stake that castle nut or at least loctite that bad boy.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul