The Yankee Hill (YHM) Nelson Booster Assembly — a matte-black polymer booster designed for handgun suppressor use. It replaces the direct-thread adapter on YHM sound suppressors (and many other suppressors that use the Nielsen piston/spring system) to provide reliable lock-up and cycling with pistols that require a Nielsen-style piston. Thread pattern listed as 3/8"-24; durable polymer construction for reduced weight and corrosion resistance.
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