If that's the plan the best COA is to register and force the underfunding right out into the open. Call the bluff.
A- you can't make a claim on a class action without attesting to ownership of the impacted property, and specifying what said property is - so pursuit of the class action effectively supplies the government with a registry anyway
B- After October 30th, unless the guns from said claim have already been surrendered or destroyed with a receipt, making the claim is essentially an invitation to be charged with illegally possessing a prohibited firearm