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Does this upper include a built-in Last Round Bolt Hold Open (LRBHO)? — 1 Answer

by USAPatriot1, from ID, United States Asked on March 18, 2025

Name Stern Defense SD 16.1in MOD4 MLOK .40SW Upper Receiver Assembly
$614.12 $600.00 Save $14.12
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Answered by STERN DEFENSE, Manufacturer from MO, United States, on March 26, 2025

There isn't one built into the upper. It does work as long as you have the lRBHO built into the Lower or MAG-AD you are using.

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