Looks like this can occur with motion blur off aswell, so likely it's a TAA motion vector issue.

Similar issue occurs in UE5 (see [Link Removed])

Steps to Reproduce

Download the licensee repro here -
Boot in 4.27, PIE, move around the level, the gun with blur quite intensely.

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ComponentUE - Graphics Features
Affects Versions4.26.24.27
Target Fix4.27
Fix Commit16558641
Main Commit16584879
Release Commit16558641
CreatedMay 27, 2021
ResolvedJun 8, 2021
UpdatedJun 8, 2021
Pull Requests
8104 - erebel55
View Jira Issue