A glenoid trial and implant assembly for reverse total shoulder arthroplasty comprising: a glenoid baseplate component including a primary bore, wherein the glenoid baseplate component is configured for fixation to a glenoid; an adapter assembly including an adapter, the adapter including an adapter flange and a body portion extending from the adapter flange, wherein the body portion is configured to be received in the primary bore of the glenoid baseplate component; a glenoid trial presenting a lateral glenoid trial face that has a bulbus shape and a medial glenoid trial face that defines a glenoid trial cavity, wherein the glenoid trial is configured to be coupled to the adapter assembly when the glenoid trial and implant assembly is in a trialing configuration; a glenoid implant presenting a lateral glenoid implant face that has a bulbus shape and a medial glenoid implant face that defines a glenoid implant cavity, wherein the bulbus shape of the lateral glenoid implant face matches the bulbus shape of the lateral glenoid trial face, and wherein the glenoid implant is configured to be coupled to the adapter assembly when the glenoid trial and implant assembly is in an installed configuration; a humeral cup presenting a concave surface, wherein the concave surface of the humeral cup is configured to abut the lateral glenoid trial face when the glenoid trial and implant assembly is in the trialing configuration, and wherein the concave surface of the humeral cup is configured to abut the lateral glenoid implant face when the glenoid trial and implant assembly is in the installed configuration; the adapter assembly including an adapter plate configured to be coupled to the adapter, the adapter plate configured to abut the adapter flange, wherein the adapter plate and the adapter are discrete components, wherein the adapter plate is configured to be received in the glenoid trial cavity when the glenoid trial and implant assembly is in the trialing configuration, and wherein the adapter plate is configured to be received in the glenoid implant cavity when the glenoid trial and implant assembly is in the installed configuration; a temporary connection configured to releasably couple the glenoid trial to the adapter assembly that provides separation of the glenoid trial and the adapter assembly without requiring disassembly of the adapter assembly; a permanent connection configured to fixedly couple the glenoid implant to the adapter assembly; and a positioning guide including a hub and a positioning guide flange that extends outwardly from the hub, the hub defining a hub cavity configured to receive the adapter plate and the positioning guide flange having a plurality of annular rings each representing different glenoid trial sizes. a glenoid baseplate component including a primary bore, wherein the glenoid baseplate component is configured for fixation to a glenoid; an adapter assembly including an adapter, the adapter including an adapter flange and a body portion extending from the adapter flange, wherein the body portion is configured to be received in the primary bore of the glenoid baseplate component; a glenoid trial presenting a lateral glenoid trial face that has a bulbus shape and a medial glenoid trial face that defines a glenoid trial cavity, wherein the glenoid trial is configured to be coupled to the adapter assembly when the glenoid trial and implant assembly is in a trialing configuration; a glenoid implant presenting a lateral glenoid implant face that has a bulbus shape and a medial glenoid implant face that defines a glenoid implant cavity, wherein the bulbus shape of the lateral glenoid implant face matches the bulbus shape of the lateral glenoid trial face, and wherein the glenoid implant is configured to be coupled to the adapter assembly when the glenoid trial and implant assembly is in an installed configuration; a humeral cup presenting a concave surface, wherein the concave surface of the humeral cup is configured to abut the lateral glenoid trial face when the glenoid trial and implant assembly is in the trialing configuration, and wherein the concave surface of the humeral cup is configured to abut the lateral glenoid implant face when the glenoid trial and implant assembly is in the installed configuration; the adapter assembly including an adapter plate configured to be coupled to the adapter, the adapter plate configured to abut the adapter flange, wherein the adapter plate and the adapter are discrete components, wherein the adapter plate is configured to be received in the glenoid trial cavity when the glenoid trial and implant assembly is in the trialing configuration, and wherein the adapter plate is configured to be received in the glenoid implant cavity when the glenoid trial and implant assembly is in the installed configuration; a temporary connection configured to releasably couple the glenoid trial to the adapter assembly that provides separation of the glenoid trial and the adapter assembly without requiring disassembly of the adapter assembly; a permanent connection configured to fixedly couple the glenoid implant to the adapter assembly; and a positioning guide including a hub and a positioning guide flange that extends outwardly from the hub, the hub defining a hub cavity configured to receive the adapter plate and the positioning guide flange having a plurality of annular rings each representing different glenoid trial sizes.