try this

pom.xml

@@ -17,7 +17,7 @@
     </issueManagement>
     <packaging>jar</packaging>
     <build>
-        <finalName>${project.artifactId}-${BUILD_NUMBER}</finalName>
+        <finalName>${project.artifactId}</finalName>
         <sourceDirectory>${basedir}/src/main/java</sourceDirectory>
         <resources>
             <resource>

src/main/assembly/package.xml

@@ -6,9 +6,9 @@
 	</formats>
 	<files>
 		<file>
-			<source>${project.build.directory}/${artifactId}-${BUILD_NUMBER}.jar</source>
+			<source>${project.build.directory}/${artifactId}.jar</source>
 			<outputDirectory>/</outputDirectory>
-			<!--<destName>mcMMO.jar</destName>-->
+			<destName>${artifactId}-${version}-b${BUILD_NUMBER}.jar</destName>
 		</file>
 	</files>
 </assembly>