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Convert your existing 12 Gauge 500, 590, 590A1, or Maverick 88 shotgun and gain the convenience of quick-change FLEX TLS-enabled components. Includes the stock and forearm adapters only. Requires a FLEX stock and FLEX forearm. Note: the forearm adapter is not compatible with 535, 835, or single-bar action slide assembly models. Note: Not compatible with 590 Shockwave or Compact Cruiser. The forearm adapter is not compatible with 535, 835, 590M, or single-bar action slide assembly models.