Recently purchased a new M4. Stock right now, so use your imagination for the picture.
Anyway, I was assembling it (no problems with the bolt insertion, as some others seem to have had) but I'm curious if the tube should have a spring in it? I did not see one in the box..
Also, is there a FAQ for the M4 on this forum? I haven't broken it in yet, but want to make sure I clean it properly before I do (seems like CLP is the way to go).
Thanks in advance!