For the next two years, the LHC will be shut down while upgrades are being made. These upgrades will result in an increased luminosity which will allow precision measurements of the properties of the Higgs boson and strengthened searches for new particles to be made. In this new high luminosity environment, the Small Wheel muon detectors of the ATLAS detector must be replaced in order to maintain excellent detection and background rejection in the forward regions of the detector. The ATLAS New Small Wheel will partly consist of thin gap chambers, approximately a third of which are being built and tested in Canada. This presentation will provide a brief overview of the construction process of these muon detectors and will describe in detail the performance tests they undergo at McGill University.