Weapon systems in RADGUNS can acquire, track, and engage aerial targets. After the acquisition radar detects a target, it is handed off to the target tracker radar (TTR) system. Thereafter, the target is tracked automatically and the FCC generates gun-pointing information. When the FCC has computed an intercept solution, the operators may fire at the target according to prescribed firing doctrine. Acquisition, tracking, and shooting engagement simulations may be executed for either single or multiple flight path scenarios. A single simulation performs a single weapon-versus target engagement, while a multiple simulation performs several single weapon-versus-target engagements where the initial target position or velocity is varied from engagement to engagement. Each of these flight paths can be run with Monte Carlo simulation by selecting multiple replications of each flight path. With the Monte Carlo option, initial search azimuth, radar wavelength, receiver noise, glint frequency, and optical tracker parameters are varied from replication to replication (changing the radar wavelength causes the clutter and multipath returns to vary as well.) The weapon system models are deterministic or transfer function type, rather than stochastic; only the endgame is stochastic. Pulse-by-pulse radar receiver model process target (including multipath), jammer and ground clutter returns. Ph and Pk are calculated using distribution theory.