The lower the centerline of the bore or bore axis, the less leverage for the muzzle to rise in recoil. Even though the double-action pistol usually has a higher bore axis than a single-action, the SIG is an efficient design. SIG introduced P229 pistol in 1992, designing it with a solid, durable stainless steel slide to absorb the recoil and increased momentum of the. At the time, the slide design was unique to the P229. While some believe the SIG P229 is based on the 9mm SIG P228, that is difficult to rationalize, although they are much the same size and general appearance.
The P228 and full-size P226 each feature stamped-steel slides with solid breechblocks.
The P229 is heavier so that it functions reliably with the high-pressure. SIG purposely designed the P229 as a service pistol and, at the time, had no full-size.
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