Prospective adverse events within forensic settings should be assessed using structured risk assessment instruments. Our aim was to identify the barriers and facilitators of a structured instrument for assessment of short-term risk within inpatient forensic psychiatric care. The instrument was piloted at a forensic psychiatric clinic. Three focus group interviews were conducted with staff. Content analysis revealed three main categories of barriers and facilitators for clinical use: implementation object, context, and users. Complexity of the instrument, insufficient continuous training and support, difficulties retrieving assessments on wards, and insecurity about translating assessments into actions were perceived barriers to clinical use. Routines for documentation improved communication and the inclusion of protective and short-term dynamic clinical factors were perceived as clinically relevant. Problem-solving ability, attitude, and motivation of staff were facilitating factors. Comprehensive risk assessment instruments require substantial support for staff to find them manageable. Systematic documentation is required to measure actual daily clinical use.