The Vollmer Selbstladegewehr 1929, or SG 29, is a prototype German automatic rifle.
The rifle was developed by Heinrich Vollmer in 1929, and then submitted in the 1930s. The SG 29 was rejected, but was later developed into the Vollmer M35. One known sample survives today at the Wehrtechnische Studiensammlung in Koblenz.
Details on the SG 29's design are sketchy, though it seems like it operates quite similarly to the later M35. Noticeable differences from the M35 include a longer barrel, different selector switch and the lack of an elongated bolt handle.