Yes the spacer was what I was talking about. After you removed it does just a regular short action staggered feed follower work without any modification? Sorry about all the questions. When I bought the action the guy had already change the bolt head from a 223 to the 308 size but had not done any thing with the mag. I was trying to figure out which would be the best way to go either back to 223 or switch to another. Either way I'm going to change the barrel.