Includes: AR receiver block (P# ARRB), folding stock mechanism with 1 1/4" sling mount (P# FSM-SMG), ULM Modular with lock ring and CAR stock adapter (P# M4M), and all mounting screws. A CAR lock ring, spanner wrench is useful for installation, and is not included, see below to purchase.
Must use alternate recoil system like ZM LR3000 or .22 LR converstions. No modification to receiver is necessary.
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