Yes they will do that. THe reason it didn't move before is because it had carbon deposits on the magazine tube. Once you cleaned it the gas rings were able to slide up and down the mag tube freely. With the bolt lock in the rear position there is nothing to hold the gas rings foward inside the barrel lug. If that gas ring is not moving freely it slows the guns cycling and if it sticks bad enough your gun may fail to cycle fully.



Just a little info about how it all works.

There are two holes in the barrel that vent gasses to the inside of the barrel lug where the gas rings sit when the bolt is in the foward position. The gasses from the burning powders push against the gas rings (what you are pointing at). The gas rings then push against the action arms which are attached to your bolt. This is what cycles your bolt rearward. Excess gasses are vented through the two inlets on either side of the barrel in the forearm.

At the rear of the bolt there is a link that attaches the bolt to a spring inside the butt stock. After the bolt fully cycles the spring pushes against the link which pushes the bolt foward again until it locks up and you are ready to fire another shell.