I have a MP 15T with the S&W branded Troy sights and a 1:9 barrel twist. A friend wants to buy it. I'd like to know what a fair selling price would be. It's like new with <500 rounds thru it. Additionally what are the differences between the 15T and the 15TS? My friend insists they are equal in value. IIRC the 15T was more expensive than the TS. I also installed a Geissele SSA-E trigger.
TIA