The properties of nuclei near the neutron $N=126$ shell, in particular their atomic masses, are critical to the understanding of the production of elements via the astrophysical r-process pathway . Unfortunately, such nuclei cannot be produced in sufficient quantities using common particle-fragmentation, target-fragmentation, or fission production techniques. However, multi-nucleon transfer reactions between two heavy ions provide a method to access and study these nuclei . The $N=126$ factory currently under construction at Argonne National Laboratory's ATLAS facility will make use of these reactions to allow for the study of these nuclei through, for example, high-precision mass measurements through Penning trap mass spectrometry. This new facility will include a large-volume gas catcher to stop reaction products, followed by a mass analyzing magnet of resolution $R\sim10^3$ to provide initial separation, a radio frequency quadrupole (RFQ) buncher to cool and accumulate the beam and injection into a multi-reflection time-of-flight mass spectrometer (MR-ToF) to provide high mass resolution ($R\sim10^5$) and suppress isobaric contaminants. The construction and commissioning of the RFQ buncher, based on the design used at the National Superconducting Cyclotron Laboratory's BECOLA  and EBIT cooler-bunchers, will be presented.
 M.R. Mumpower et al., Prog. Part. Nucl. Phys., 86, 86 (2016)
 V. Zagrebaev and W. Greiner, Phys. Rev. Lett., 101, 122791 (2008)
 B.R. Barquest et al., Nucl. Instrum. Methods A, 866, 18 (2017)