Which significant product design change was implemented in the M16A1 to address the critical malfunction issues experienced during early Vietnam War deployment?

The M16 rifle represents one of the most significant product designs in military history, transforming infantry combat in the late 20th century. However, its early deployment during the Vietnam War was plagued with issues that affected soldier confidence and battlefield performance. This poll tests your knowledge about the corporate and product design history behind this iconic American firearm.

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Addition of a chrome-plated chamber and bore to prevent corrosion and jamming
Replacement of aluminum receivers with titanium to reduce weight
Introduction of a hydraulic buffer system to reduce recoil
Conversion from direct impingement to a piston-driven operating system