Introduced in 2016 and manufactured in Austria as a high precision rifle for use in competition or as a sniper rifle using a caliber interchangeability system found on many of the modern sniper systems fielded across the globe. The SX-1 is capable of switching calibers (.308 Winchester, .300 Winchester Magnum, or .338 Lapua Magnum) with a single tool. Fitted with a clamp on muzzle brake, fluted barrel, Midwest Industries handguard with full-length top rail, 12 MOA receiver rail, manufacturer and model markings on the left of the receiver, finger groove pistol grip, and adjustable side folding stock. While the rifle itself received good reviews, the high price tag meant that Ritter & Stark went out of business in 2018 with a limited number of rifles produced. Includes hard case, two extra barrels (one for each alternate caliber), magazine well adapter, one magazine for each caliber, and one bolt head for each caliber.

Excellent overall, retaining 97% original black finish with a few light handling marks and high edge wear. The .300 Winchester Magnum barrel and bolt head are numbered to match the receiver, while the .338 and .308 sets are numbered to other rifles. Mechanically excellent. Case and accessories are all excellent with limited storage and handling marks.