Titan XS No.13 Air Rifle Mainspring
S3047
The Titan XS No.13 is a replacement mainspring for spring-piston air rifles, supplied as the No.13 fitment on the Titan XS application chart. Per that chart it is the spring for the Gamo Paratrooper, CF20, CF30 and CFX, and UK spares retailers also list it against the Cometa FAC and Weihrauch HW85. Titan XS springs are wound from high-grade Swedish vanadium steel, then heat-treated and tempered for consistent power and a long service life, with a low-friction finish that keeps dieselling to a minimum. The No.13 carries a published uncompressed length of around 340mm, an outside diameter of about 19.1mm and a weight near 108g, though figures vary slightly between sources. As with most replacement air-rifle springs, it may need a coil or two removed to tune the fit and stay inside the 12 ft/lb limit, so a chronograph check after fitting is sensible. If your rifle is not named here, match by the Titan number for your model rather than by gun name alone, and have the work done by a competent airgunsmith.
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