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    Lewisville, TX
  1. I am semi-retired and I am taking a self-passed and self-taught Firearms Armorers course. I have covered over 25 different firearms in this course and now I am on the AR-15 Rifle course which is my last firearm in the Armorers course. I hope to become a part-time light Gunsmith in the future. I am now working part-time with a Gunsmith that has over 40 years’ experience. I have my CHL and my FFL. There are many questions covering this firearm and I have answered them to the best of my ability but during my study and research I am having some problems with these quiz questions. Either I am not sure of the correct answer or I have conflicting answers. Can you help me determine the correct answers for these quiz questions? Please correct my wrong answers! Thanks for your help. 1. The AR -15 was designed by a) Ronnie Barrett b) Max Atchisson c) Eugene Stoner d) Mikhail Kalashnikov 2. The front sight is held on by a) Loctite b) two tapered pins c) one large roll pin d) a quick release clamp 3. How is the gas tube retained in the front sight? a) By a small roll pin b) Friction c) The gas tube is not actually held in place, as it needs to be free floating d) By Gunsmith glue 4. What gun part is attached to the top of the bolt and accepts the gas from the rear end of the gas tube? a) The bolt carrier key b) The bolt face c) The snap ring d) The gas elbow connector 5. What holds the firing pin in place inside of the bolt? a) The tapered retaining roll pin b) The firing pin retaining pin c) The extractor's tail d) The ejector's shoulder 6. The gas from the fired cartridge exits the barrel and a) enters the front sight and then the gas tube. b) enters the gas connector piston and then the front sight. c) enters the front sight and then the bolt carrier d) enters the gas tube and then the bolt carrier. 7. What causes the bolt to rotate in the bolt carrier? a) The bottom of the carrier key cams the rear end of the bolt and rotates it. b) The expanding gas on the bolt face that comes directly from the gas chamber. c) The cam-pin hitting the bolt carrier d) The counter rotation of the barrel extension lug 8. What prevents the cam-pin from rotating in the bolt carrier? a) The extractor b) The firing pin c) The bolt d) None of the above 9. What pushes the hammer rearward after the gun is fired? a) The rearward motion of the bolt, bolt carrier and the firing pin b) The downward motion of the bolt carrier key as it hits the hammer strut c) The rotation of the bolt d) Both b and c 10. The secondary sear system's engagement is the contact between the hammer and a) the disconnector b) the receiver nut roll pin c) the trigger d) the rear of the bolt 11. The engagement of the hammer and the trigger best describes a) the primary sear system b) the secondary sear system c) none of the above 12. The disconnector is also the secondary sear - True or False? 13. In the following scenario, the gun has been fired, the bolt has returned forward into its locked up position and the trigger is still pulled, which sear system is holding the hammer rearward? a) The primary sear system b) The secondary sear system 14. If the gun is at rest with the finger off of the trigger, the hammer is cocked and there is a round in the chamber, which sear system is holding the hammer rearward? a) The primary sear system b) The secondary sear system 15. The rear lips of the magazine box are what activates the bolt stop on the last round in the magazine - True or False? 16. The bolt catch will hold the bolt carrier assembly rearward after the last shot has been fired - True or False? 17. With the magazine out of the receiver, the bolt will still be held rearward after a shot has been fired - True or False? 18. What controls the cyclic rate of the AR-15/MI6 in full auto? a) The diameter of the gas tube b) The friction piece c) The friction ring d) The buffer assembly and the action spring