Recommended that you log into NKO prior to clicking on any. Inspects posts to ensure proper security operations and. duties. • Administer breathalyzer and field sobriety tests. perform the duties of a Small Arms Instructor for rifles, pistols . View/Submit Answers" next to the course you wish to submit answers for. Assignments. The M16A3 service rifle shown in Figure 11-1, is a 5.56mm, magazine-fed, gas- operated. Table 11-1 — Technical Characteristics of the M16 and the M4A1. Before each use and after cleaning, a function test should be performed.