You can make your own lock-ring removal tool with PVC pipe or a coffee can. (I used the can). There used to be instructions here on the site, but I don't know if you can still Search back that far.
USAF: 1989-1997. Desert Shield (Saudi Arabia), Desert Storm (Kuwait, Iraq), Provide Comfort (Kurdistan), Restore Hope (Somalia), Uphold Democracy (Hati), Joint Endeavor (Bosnia), Support Hope (Rwanda). USAFR: 1997-2014. Iraqi Freedom (Iraq), Enduring Freedom (Afghanistan). Retired, Oct. 2014.