The National Instant Criminal Background Check System Improvement Amendments Act of 2007 (NIAA) directs States to report reasonable estimates of the number of records available to the National Instant Criminal Background Check System (NICS). The findings for the Year 3 analyses include: 1) 84 percent of the 56 States/territories surveyed provided records estimates compared to 75 and 79 percent for surveys performed in Year 1 and Year 2. 2) State record repositories contain 84 percent of the records housed by originating agencies. However, due to the limitations of the estimate quality, this percentage is not believed to be a reliable representation of records being reported to Federal databases. 3) The statistical model validated the reasonableness of the overall estimates reported by the State record repositories and the originating agencies. 4) The State record repository and originating agency estimates are considered reasonable and have face validity. The data provided appear to be reasonably accurate estimates of the numbers of records they are supposed to be estimating and the qualitative information provided by the 47 responding States enhanced that appearance of reasonableness by documenting the challenges that inhibit States' ability to make more precise estimates. 5) The statistical model could not be used to develop estimates of data from non-responding States and territories. This was especially true of the larger non-reporting States because they are atypical of the States that did report and the model confidence bounds of the larger reporting States were too wide as to make credible assessments regarding their reasonableness. Report recommendations include focusing technical assistance on problems and challenges identified consistently through the review of all three estimates cycles, promulgating Promising Practices documents on the BJS website to encourage peer-to-peer technical assistance, and reconsidering the survey methodology to narrow the scope and improve the quality of estimates.