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

New version of M&P15 T:
Product: Model M&P15T - 5.56 mm, Tactical

Previous (Troy) Version of M&P15 T:
Product: ARCHIVE: Model M&P15T Rifle

M&P15 TS:
Product: Model M&P15 TS

FWIW, (and the price could have been based upon current availability, rarity etc), when I purchased my TS under the "Qualified Professional" program from Bud's Gun Shop in January, the Troy version of the 15 T was selling for about $50 more than the TS. However, the current version of the 15 T is priced significantly lower than the TS. I hope that helps a bit.

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642-1, M&P15 TS