Dont forget the barrel vice adapter its important to !!
After about 6-7 thousand rounds I noticed my targets looking like a shotgun pattern so the first thing I did was check to see if the barrel was moving and it sure did 1/2 inch easy. Tightened up with the barrel nut wrench using the vice adapter from tacticool and havent had any problems since but I still check the barrel for movement after each range visit now.

Thats the only problem I have ever had with my little girl so I sure am not complaining