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The Sauer 202 is a lightweight bolt-action rifle manufactured by Sauer & Sohn in ... This rifle has a modular barrel-change system allows to change between calibers ...
The barrel change system has been renewed, and 404 barrels are not interchangeable with the older 202 barrels. As opposed to the 202, where the whole bolt had to be changed when changing to another cartridge group, only the bolt head is replaced on the Sauer 404. [4]
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
The term caliber change in firearms refers to the process of permanently altering a firearm to allow it to fire a different cartridge than the one it previously fired. With a bolt action rifle, this is mostly done by reshaping the current chamber through machining it with a new reamer, or by replacing the barrel with a new barrel, which has a new cartridge chamber machined into it.
This way the barrel can be changed using only simple hand tools, eliminating the need for a vise and an action wrench. This mechanism can be seen as a forerunner of the barrel change system later introduced in Sauer 200, SIG Sauer 202 and 200 STR. Original replacement barrels can be difficult to find. [9]
1844 — Luxurious double-barrel musquets (early shotguns), hunting arms become more important now. 1849 — Coop with Spangenberg and Heinrich Sturm, company now "Spangenberg, Sauer u. Sturm, Suhl". 1873 — Johann Paul Sauer and his sons Rudolf and Franz found the company J. P. Sauer & Sohn. 1879 — Company patents backloading rifle.
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Another example of a modular firearm system is the increasingly popular quick barrel change systems, which is found on some new rifles like for example the Blaser R8, Roessler Titan and SIG Sauer 200 STR.