Crossbow accessory for lower receiver of rifle and related method

A method of providing a crossbow using a modular lower receiver of a rifle, the modular lower receiver having a housing, a trigger extending from the housing, and a hammer operated by the trigger, the method comprising the steps of:

• a. providing an accessory, the accessory including:
• I. a riser having a central portion and opposing end portions;
• ii. first and second limbs coupled to the opposing end portions of the riser, the first limb extending from the riser toward a first limb tip, and the second limb extending from the riser toward a second limb tip;
• iii. a bowstring extending between the limb tips of the first and second limbs for propelling an arrow;
• iv. an elongated frame member having first and second opposing ends, the first end being coupled to the riser;
• v. a bowstring release capable of being disposed proximate the second end of the elongated frame member, the bowstring release including a bowstring hook for selectively engaging the bowstring, and an actuating lever for releasing the bowstring hook;
• b. fastening the second end of the elongated frame member to the modular lower receiver;
• c. retracting the bowstring toward the second end of the elongated frame member for pulling the bowstring away from the riser toward a drawn position proximate the second end of the elongated frame member, the bowstring being engaged with the bowstring hook of the bowstring release when the bowstring is in its drawn position;
• and
• d. positioning the actuating lever of the bowstring release proximate to the hammer of the modular lower receiver for being contacted thereby when the trigger of the modular lower receiver is operated.