The bolt-action, clip-fed rifle found on the sixth floor of the Depository, described more fully in appendix X, is inscribed with various markings, including “MADE ITALY,” “CAL. 6.5,” “1940” and the number C2766.[C3-126] (See Commission Exhibit Nos. 1303, 541(2) and 541(3), pp. 82-83.) These markings have been explained as follows: “MADE ITALY” refers to its origin; “CAL. 6.5” refers to the rifle’s caliber; “1940” refers to the year of manufacture; and the number C2766 is the serial number. This rifle is the only one of its type bearing that serial number.[C3-127] After review of standard reference works and the markings on the rifle, it was identified by the FBI as a 6.5-millimeter model 91/38 Mannlicher-Carcano rifle.[C3-128] Experts from the FBI made an independent determination of the caliber by inserting a Mannlicher-Carcano 6.5-millimeter cartridge into the weapon for fit, and by making a sulfur cast of the inside of the weapon’s barrel and measuring the cast with a micrometer.[C3-129] From outward appearance, the weapon would appear to be a 7.35-millimeter rifle, but its mechanism had been rebarreled with a 6.5-millimeter barrel.[C3-130] Constable Deputy Sheriff Weitzman, who only saw the rifle at a glance and did not handle it, thought the weapon looked like a 7.65 Mauser bolt-action rifle.[C3-131] (See chapter V, p. 235.) The rifle is 40.2 inches long and weighs 8 pounds.[C3-132] The minimum length broken down is 34.8 inches, the length of the wooden stock.[C3-133] (See Commission Exhibit No. 1304, p. 132.) Attached to the weapon is an inexpensive four-power telescopic sight, stamped “Optics Ordnance Inc./Hollywood California,” and “Made in Japan.”[C3-134] The weapon also bears a sling consisting of two leather straps. The sling is not a standard rifle sling but appears to be a musical instrument strap or a sling from a carrying case or camera bag.[C3-135] [Illustration: COMMISSION EXHIBIT NO. 1303] [Illustration: COMMISSION EXHIBITS NOS. 541(2) AND 541(3) Photograph of markings on C2766 Mannlicher-Carcano rifle.] Expert Testimony