I think the indoor range went away first - the usual EPA lead contamination hand-wringing. Then the .22 rifles went back to DCM and were probably sold through the DCM and later CMP processes.
The school still has a JROTC unit, it still has "ARMORY" painted in military stencil on the Petty Officers' door, but the rifle team shoots airguns now. I'm a bit amazed that they're retained that much.