I sent my Leupold Mark 4, 4.5-14x50 in for repair & asked to have the M1 turrets changed to M5's. Got a call from them today that they will fix my scope (looks like dust inside) and the turret conversion will be $170 (maybe $180, I didn't write it down). This is the total cost for both turrets. The scope is the non-illuminated TMR in the SFF. Should have it back by the end of next week and will report back then.