What you see first is a three part assy of the bolt retaining pin/plunger that goes in a slot from the "bottom" of the reciever and up "not" from the top down (which I think may be your problem). Then the spring goes inside the slot and the retainer block attaches via threads from a screw that's also holding the mag release in place which keeps upward spring tension on the plunger. To remove the bolt you must push the plunger down then pull the bolt back and release the plunger which will push up under the front of the bolt releasing it thus allowing you to push up on the bolt head for removal. To reinstall the bolt , insert it and with the front of the bolt slightly forward, push down on the plunger then push the bolt forward. If you have the three parts installed correctly, you should have no issues moving the bolt back and forth .. Hope this helped.. Note: In order for you to remove this assy, you HAVE to remove the action from the stock.