diff --git a/fifa17-recon/tools/blaze_responder_v3b.py b/fifa17-recon/tools/blaze_responder_v3b.py
index b1e3c76..7f05421 100644
--- a/fifa17-recon/tools/blaze_responder_v3b.py
+++ b/fifa17-recon/tools/blaze_responder_v3b.py
@@ -590,6 +590,12 @@ FUT_RS4_CONFIG = (
     # NOTE: do NOT advertise itemDbVersion/checkServerDbVersion here or in any
     # response -- proven inert (wf_96b6c0c5): they are JSON field names that route
     # to the value-SKIP handler 0x180135ff0, never compared. See docs/CARD_SYSTEM.md.
+    # EXPERIMENTAL SBC (env-gated, default OFF to keep the baseline clean): the SBC
+    # set-list deser (0x180154990) checks FUT/SBC_USE_STUBS -- FIFA may render
+    # built-in stub SBCs with no server content. enableSquadBuildingSetsFeature gates
+    # the SBC menu. Set FUT_SBC=1 to try it live (ENDPOINT_MAP SBC leads).
+    + ([("enableSquadBuildingSetsFeature", "1"), ("FUT/SBC_USE_STUBS", "1")]
+       if os.environ.get("FUT_SBC") else [])
 )