Maybe a minor non-issue Got a new 22/45 this week. Intend for this to be iron sighted (fiber optic) to use in Rimfire Challenge and other local .22lr matches. Haven't fire a round yet, but putting it through it's paces on bench and the Bolt Stop Thumb Release became in-operative (loose). Turns out the Bolt Stop Stud (part 10) is press fit into the Bolt Stop (9) and had worked it's way out. Easy enough to push the Trigger Pin just enough to release the Bolt Stop and then using my vise press it back in place. Reassembled and all is fine. Anyone else have this problem? NOTE: The other MK IVs (non-Lite) seem to have a one piece (#7) Bolt Stop and only the LITE seems to have this press fit Stud.