This is the complete end cap assembly. Composite Version. This version has replaced 02-ECM on new A-5's, which is a metal version.
Here is a little more information on A5 and X7 end caps
End Cap Complete on the Tippmann A-5 Basic Diagram v2 2009-08-06End Cap Assembly on the Tippmann A-5 Basic 2011 Diagram
End Cap Assembly on the Tippmann A-5 RT Body Diagram v2 2009-09-04
End Cap Assembly on the Tippmann A-5 Basic 2011 Diagram