Gary - can't help with the actual Q1/Q2 constriction on a 12ga Reproduction (bc I haven't got one) however, I can share that my standard 12ga IC/MOD is constricted .006/.010
The constriction (IC/MOD) on my 12ga SSS's are .008/.012
16ga - IC/MOD = .011/.017
26" barrels? I agree w/you - no discernible difference to me.
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