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When fully assembled, a firearm’s rear setup looks straightforward. Before installation, however, it is a carefully matched chain of precision interfaces. The receiver must accept the adapter, the adapter must provide the correct attachment surface, the folding mechanism must match that surface, and the stock or Arm Bar must fit both the mechanism and your preferred length of pull. The cleanest way to build a modular rear system is to work from your firearm outward. Choosing a stock first …