GSh-6-23M 6-barrel autocannon on display in a museum
Source: Vitaly V. Kuzmin -
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The SPPU-6 is a large gun pod fitted with a single GSh-6-23 autocannon on a flexible mount.
The GSh-6-30 is the larger counterpart to the GSh-6-23 that fires the 30x165mm round. Both weapons were in development at the same time and share some design element.
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