If you are looking for proper disassembly, cleaning & maintanence and re-assembly instructions you can download the Bushmaster ACR Operating and Safety Manual at:
http://www.bushmaster.com/electronic-documents/ACR-owners-manual.pdf
Let me know if you have any questions!
http://www.bushmaster.com/electronic-documents/ACR-owners-manual.pdf
Let me know if you have any questions!