機器
arms
army
automatic
background
barrel
black
bullet
carbine
combat
crime
danger
defense
fire
firearm
firearms
forces
gun
isolated
m16
m16a2
m4
marines
metal
military
modern
object
patch
police
protection
rifle
security
shot
shotgun
sniper
soldier
special
steel
swat
target
trigger
us
us army
usmc
violence
war
warrior
weapon