RSO Firearm Stoppages and Malfunctions 5

Question 1

An RSO observes a shooter's revolver cylinder binding and refusing to rotate after live firing in sandy conditions. What is the most likely cause?

Accepted Answer

Debris or fouling accumulation around the cylinder axis or crane preventing rotation

Answer

Sand, grit, or fouling around the cylinder crane or axis pin can bind cylinder rotation; thorough cleaning resolves this environmental malfunction.

Question 2

During a carbine course, a shooter's AR-15 goes fully into battery but fails to fire when the trigger is pulled. The primer shows a light strike mark. What should the RSO first suspect?

Accepted Answer

A worn or broken hammer spring or debris obstructing the firing pin channel

Answer

Light primer strikes in AR-pattern rifles are commonly caused by a weakened hammer spring or carbon fouling restricting firing pin travel.

Question 3

Which condition describes a firearm that continues firing after the trigger is released on a semi-automatic platform?

Accepted Answer

Slam fire or runaway condition

Answer

A runaway or slam-fire condition occurs when the disconnector fails to hold the hammer, causing continuous fire independent of trigger release.

Question 4

A shooter on the range has a semi-auto pistol with the slide locked back but the magazine still has rounds. What should the RSO identify as a potential cause?

Accepted Answer

The slide stop was inadvertently engaged by the shooter's thumb during firing

Answer

High-grip shooters often place their thumb on or near the slide stop, which can prematurely lock the slide back before the magazine is empty.

Question 5

After a cease-fire is called due to a range malfunction, when should the RSO allow shooters to handle their firearms to clear malfunctions?

Accepted Answer

Only after the RSO has assessed the situation and determined it is safe to proceed

Answer

The RSO must evaluate the nature of the malfunction before permitting firearm handling to ensure no hangfire or other hazard is present.

(RSO) Certified Range Safety Officer Practice Test

(RSO) Certified Range Safety Officer Practice Test

RSO Firearm Stoppages and Malfunctions 5