However, it seems that the Model 28/30 went with a single piece nose cap:
In another effort to improve the stability of the barrel and ease production, the nosecap of the rifle was altered and improved. The early m/28 used a two part nosecap with a separate plate to center the cleaning rod and stabilize the front portion of the nosecap. This was changed to a solid style nosecap of one piece design late in production and this style nosecap would be used on the m/28-30. Also an improved cleaning rod retention nut would be used in the stocks instead of the older m/91 style used on the m/28 and model of 1924 rifles. In order to place the barrel properly in the new solid faced nosecap, a design technique borrowed from the Swiss was incorporated into the new m/28-30. An aluminum sleeve with a flange at the front was placed on the barrel and fit into the stock at the nosecap area. This acted in a fashion to “float” the barrel and prevent any interference in the nosecap on sighting of tension in the stock as the rifle was fired and the barrel became heated. These modifications were quickly adopted into the assembly line of the m/28-30 by April of 1934 the first rifles with all of these new improvements began to roll off the production floor.