Is the bind the guide rail side edges or end plate to the upper receiver channel itself, or the chamber insert to the chamber?

http://rrages.com/ar15/cmmg22lrconv/index.htm
The lower type O ring insert is a little better at releasing from the chamber in the above link since it has a slight push off when you open the chamber, but in either case, you still need to take a 223 chamber brush to clean the 223 chamber  during cleanings.  Hence the 22lr ammo is still going to have blow back around the chamber adapter to the actual chamber walls itself to build up fouling there, and this will cause the binding build up of the adapter to the chamber walls is not cleaned via 223 chamber brush scrubbing with CLP.

Also, to tell if you really have the chamber clean and dry, New/white 30 cal mop with just a hint of CLP on it on a second of cleaning rod,  insert it into the chamber as deep as you can get it, twist it a few time, and pull the mop out. If it comes out with any fouling, you suck at scrubbing a chamber.
I bring this up, since often its the last of chamber cut (at end of say a case neck when in the chamber) that does not get cleaned correctly, and this build up with not only cause problems with an chamber adapter, but actual 223 ammo as well.

Best guess on the bursting, you have a L cut top of firing pad hammer, the hammer spring it too strong for the adapter kit, and the new adpter kit needs to have it parts polished.
Hence the bolt is not coming all the way back to cock the hammer to the disco, and this is causing the burst, cycling problems.

This is how to break it down,
[youtube]https://www.youtube.com/watch?v=j0iwQxpwXQ0[/youtube]

Once you have it apart,
Polish the spring rod guide and make sure that there is not a bur on the entrance to the spring channel on the bolt.
On the rail, polish the top and bottom of it, the inner sides of the it, and make sure that there is edge burs on the rail, nor on the side slots of the bolt.
As for hammer type, this is the type of hammer you really want.


Not this type of hammer,



As for if you are not running a reduced hammer spring needed to get the the bolt once the parts are polished to cycle correctly with weaker kind of ammo, then may have to run hotter mini mag 22lr ammo to get the action to full cycle instead.

And again, do not do any thing to the chamber of the adapter, since if you over large it in any way, this is going to cause the cycling problem to become worse.