Virtue Crown SF-R Speed Feed Spire 3/4/IR/CTRL LimeThe Virtue Spire Crown SF R shown in the lime green color here is the budget friendly speed feed with many of the same design features found in the more expensive Crown SF. The Crown SF R features the same locking speed feed ring that fits securely in place on the CTRL, Spire IR, IR, Spire III and Spire IV, with the main difference being the design of the fingers. The Virtue Spire Crown SF R fits the following loaders: Spire 3, Spire 4, Spire IR,