Just learned this about the Indexing System that you all should be aware.
On the Indexing System, there is a free spinning sliver piece that has 2 tabs on it to lock in the ratchet.
You need to look closely at these tabs because 1 is slightly smaller than the other. A little hard to distinguish..maybe mark it in future production??
in the photo, the smaller tab is on top..ya..hard to tell at 1st, but you will see it
When you insert the barrel, you want the smaller tab at the top position.
I also had a small problem thinking that my barrel was stuck and could not be removed.
I had the ratchet all the way to the top level, which was still locking up the barrel.
Solution: From the top position, move the ratchet down 2 clicks and the barrel should remove easily
hope this helps
Mike