By Zara Woodcock Viewers of Antiques Roadshow were in shock over the value of a gift one of the guests received. On Sunday night, a guest turned up to learn about the value and history of a pistol he was given as a gift. Expert Robert Tilney was around to provide the valuation over the pistol and was excited to share the true value. The owner of the gun revealed he was gifted the item as a teenager by his stepfather. The guest shared: “It’s probably 1770, 1780.” Speaking about his stepfather, he said: “It was a gift from one of his business partners and later on, he wasn’t interested, so I rec…