AGI - Products Mossberg 500 Series Shotguns

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Mossberg 500 Series Shotguns


Mossberg 500 Series Shotguns

An excellent value for the money, the Mossberg 500 series has seen massive acceptance with sportsmen all over the world. However, these shotguns do have a few problems that this course will help you to solve inexpensively. In addition, numerous tricks and techniques are provided to insure reliable operation. Just the assembly and cleaning portion of this video course will save you $30-40. A rare factory cutaway is used to clearly demonstrate the inner workings.

If you want the quick course on how to get the Mossberg 500 Shotgun apart, back together, and operating as intended, then this course is for you (if you want the long course, look into our basic 108 hour Professional Gunsmith Course.) 

Among the items covered are:

  • Bob shares his knowledge of the history of Mossberg firearms and its founder, Oscar Mossberg
  • While working for Iver Johnson, Oscar Mossberg invented the transfer bar, which is still used in many firearms today
  • Oscar worked for different firearms manufacturers in America, until he and his partner made a four-barreled .22-caliber firearm. This was the gun that was first manufactured by him and his sons under the name O.F. Mossberg & Sons
  • After manufacturing several models of firearms, they produced the first model of the Mossberg 500 in the early 1960s. Unlike many other firearms manufacturers, they continued to make the Mossberg 500 better and better through incremental design improvements, a process culminating with the excellent shotgun that they manufacture today
Design & Function
  • Through the use of different cutaway firearms, we are shown the function and interaction of parts up close that we would not normally be able to see in their working environment
  • The primary and secondary cartridge stops and their function are clearly shown and demonstrated
  • With views both inside and outside of the gun, you are shown how the bolt functions against the bolt slide.
  • Extreme close ups are shown of the bolt lock (locking block), and its function is explained
  • The two extractors are shown and their differing functions are explained
  • The sequence of cartridge feeding is demonstrated and explained in depth
  • The ejector is shown and its function is explained
  • The safety system is shown and explained
  • Action bars are shown and their functions are explained
  • Spare parts information is discussed
  • Fire control system is shown and explained in depth
  • Views of individual parts help us to understand their functions
  • As the firearm is disassembled, Bob continues his explanation of how the various parts function
  • Barrel removal is shown and explained
  • Trigger guard removal is shown, along with the cartridge stops
  • The bolt slide, elevator and bolt are removed from the receiver
  • Magazine tube removal is shown and explained. Cautions are given
  • Magazine spring is removed from the magazine tube and the follower is removed from the receiver
  • Forearm and action bar assembly are shown being taken out of the receiver
  • Buttstock removal is shown
  • Safety disassembly is shown and explained
  • Ejector removal from inside the receiver is demonstrated
  • Bolt disassembly is shown and explained (bolt lock, firing pin and extractors)
  • Trigger guard disassembly is shown and explained in depth (drawing a picture of the springs positions inside the trigger guard is suggested)
  • Forearm disassembly is shown and explained (special tool is used)

Cleaning & Lubrication

  • AGI cleaning & lubrication methods shown, along with the reasons for their use
  • After cleaning, dry with air gun, or in the oven on Warm ~185-200 degrees (metal parts ONLY)
  • Lubing the Bob way, and what kind he likes
Reassembly & Troubleshooting
  • Safety reassembly is shown and explained
  • Action bar assembly is installed into the forearm
  • Magazine tube is reassembled, placed inside of the forearm and is shown being screwed into the receiver (tips are given for using a vise)
  • Ejector reassembly is shown and explained
  • Bolt is reassembled and explained (tips are given for extractor fit and function)
  • Troubleshooting tips firing pin protrusion is shown and explained (positive protrusion is defined and specs are given)
  • Troubleshooting tips new style bolt is shown and its variations are explained
  • Trigger guard (housing) is reassembled. The specific order of parts being installed is shown and explained (special tools are shown, as well as how to make and use them)
  • Function of various parts in the trigger housing is shown and described in depth
  • Buttstock being reassembled onto the receiver is shown and tips are given for stock longevity
  • The function of the elevator is shown and explained (tips for tuning and troubleshooting are given)
  • The bolt, elevator and bolt slide are shown being installed into the receiver
  • Cartridge stops are shown being installed into the receiver. Their functions are further explained
  • Barrel being installed into receiver is shown
  • Function and safety checks are explained and shown being performed
  • Various buttstocks are shown
  • Various pistol grips are shown
  • Various forearms are shown
  • Shell holders are discussed and shown
  • Front handguards (heat shields) are shown

If you noticed how often the terms explanation and demonstration are used, you may be getting some idea of why this course is necessary for any Mossberg 500 Shotgun owner, or someone who intends to be.

How much does your Professional Course cost? The answer can be found in our intro pack. We recommend to anyone considering our Professional Course that they get the Introduction to Gunsmithing Packet as this packet includes a video with a sample gunsmithing lesson. It also includes an Enrollment Form that lists the costs of each Course level available as well as the material covered in each level.

Do I have to pay $7 s/h on each retail video? No, we discount shipping on multiple video orders. The new website calculates shipping based on weight and destination. In most cases, the actual shipping is less than listed in the catalog.

Is there a time limit to complete your course? No, our course is self-paced. As you complete sections of the course and submit your tests, we provide certification of completion for that portion of the course.

Can I become certified by taking your retail courses? Answers vary. If you are intending to purchase all the videos in our Law Enforcement Armorer's Course, for example, as long as you buy the test separately you can obtain a Certification as a Law Enforcement Armorer once you complete the testing successfully. Otherwise you would need to purchase one of our certified professional courses in order to obtain a profession Gunsmithing certificate.

What does your Professional Gunsmithing Course Introductory Lesson cover?The Introductory Lesson is one hour and includes complete information on how to get started Gunsmithing. You will also learn how to insure reliable auto-pistol feeding and how to prevent jams, checking and adjusting "range" on Smith and Wesson revolvers, how a gas system works on a Colt AR-15, AR-7 trigger repairs, timing and understanding cartridge stops of a Remington 870 and much more! 

Are your Courses guaranteed? Yes! The American Gunsmithing Institute is proud to offer a 100%, "Bulletproof Guarantee." We are so sure of the quality of our Courses and products that you may return any item purchased directly from AGI for a full refund (less shipping) for up to 90 days after purchase date. Defective DVDs and videos will be replaced for up to 1 year. The only question we will ask is: "How did we fail you?"

Does AGI offer other Certified Courses aside from the Professional Gunsmithing Course? Yes. We also offer a Certified Machine Shop Course, complete with Lathe, Mill and general Machine Shop instruction. Additionally AGI offers a Certified Welding Course and a Certified Locksmithing Course.

What do the Disassembly/Reassembly Courses cover? AGI offers D/R Courses that clearly demonstrate the complete process of disassembly and reassembly step-by-step. The Courses use close-up views to provide comprehensive instruction. Each DVD Video Manual covers one specific model or family of firearms and is indexed to help the user quickly find the information that they are looking for. At the price of only $19.97 each (plus s/h), these video manuals are must have support information for anyone who owns one of these firearms.  

What do the Armorer's Courses cover?AGI's Armorer's Courses teach you how to disassemble, maintain, repair and reassemble your choice of the 51 guns featured. These videos are packed with exclusive information and are equal to a complete Factory Armorer's Course! While our Disassembly/Reassembly Courses contain invaluable information, our Armorer's Courses contain so much more. Master Gunsmith and AGI Instructor Robert "Bob" Dunlap explains design and function using exclusive factory cutaway firearm models, giving you close-up details of the internal functions you would not otherwise be able to see. All AGI Armorer's Course DVDs include a FREE printable schematic!    

Are your Instructors experienced in their fields? Absolutely. Master Gunsmith and AGI Senior Instructor Robert "Bob" Dunlap is a widely respected authority in the firearm industry and spent over 35 years as the senior instructor at Lassen College's internationally known Gunsmithing School. Master Gunsmith Gene Shuey is a world class custom gun builder, former world class competitive shooter and current trainer specializing in 1911 and Glock pistols, IPSC limited and open class guns, and high-end custom rifles. Darrell Holland is a well known custom rifle builder, writer and lecturer who is always inventing new performance shooting products. Ken Brooks is a graduate of the renowned Gunsmithing program at Lassen College and continues his journey by working full time for Bob Dunlap. Gene Kelly is the President of AGI and the Gun Club of America. He graduated from Lassen College's Gunsmithing program and worked as a Professional Gunsmith prior to founding AGI. T.R. Graham is a NRA Certified Pistol Instructor and is a known authority, author and Gunsmith specializing in Glocks and other handguns. Master Armorer John Bush is an AGI Instructor and a consultant to manufacturers and importers of military firearms, and is certified as an Expert Witness in firearm cases.