AGI - Products 1873, 1866 ,& 1876 Rifles

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1873, 1866 & 1876 Rifles


1860 Henry, Winchester 1866, 1873, and 1876 Rifles

Bob Dunlap completely understands the design, function, and repair of this toggle link design, descended from the volcanic pistol, and beloved by generations of shooters, and today cowboy action crowd, for its smooth cycling and reliable feeding. More importantly, you will also after he finishes teaching you its mysteries. A cut-a way gun and AGIs extreme close-up video, is used so that you can actually see how all of the systems work and the parts interact. If you want the quick course on how to get these cowboy classics apart, clean, 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:


  • Discussion of the basic similarity of all of these volcanic derivatives
  • Discussion and demonstration of the differences between the Henry, the 1866, and the 1873 models, including loading, magazines, trigger springs, and side plates
  • Bob shows you a rare original 73 in .22 short, discusses its shortcomings and Ubertis less than perfect fix on its replica
  • What to avoid when removing the magazine tube from the guns
  • A not uncommon problem with the bolts, and its cure
  • Discussion of the volcanic pistol and its cartridge
  • B. Tyler Henry steps up
  • Oliver Winchester steps into the picture, acquiring both the gun and Mr. Henry
  • A little bit of history, Cowboys and Indians, and decorations of the guns

Design & Function

  • Explanation and demonstration of the Toggle Lock system ever see a Luger
  • Weaknesses of the system
  • Trigger blocking safety shown
  • Visual demonstration of the firing/loading cycle using the cut-a way
  • How the safety notch works
  • How the extractor works, and what actually causes the empty to eject
  • How the toggle lock works, and causes the carrier to rise and fall
  • How the gun is able to feed cartridges of different lengths, i.e., .38Spl/.357 mag, or the kindest cut of all
  • Demonstration of the loading and ejection cycle
  • Explanation of positive and negative sear engagement, what you want, and what you cannot live with at all
  • A lazy carrier; what it causes, why it causes it, and how to make all of those problems go away


  • Extensive disassembly, parts not removed have removal described, including extractor, forend hanger, and front sight
  • Difference in the side plates on a 73 and a 66, why you can remove one with impunity, and should not remove the other unless absolutely necessary
  • What to do to make the carrier rise smoothly
  • Trigger and hammer removal shown, and the differences between the Henry/66 guns and the 73/76s 

Cleaning & Lubrication

  • AGI cleaning & lubrication methods shown, along with the reasons for their use


  • Making sure you have no parts left over
  • Firing pin protrusion spec given, and how to correct it if there is not enough

Special Bonus- Cowboy Tune-up

  • Parts to smooth
  • What tensions can be reduced, and which should not. In addition, what results to expect if you do not follow the advice
  • Strain and what results if there is not enough
  • The commonly fouled-up trigger job, do not be an amateur. Pretend it is really a Colt. If you do not know what that means, get the trigger course. Be safe, not sorry
  • Tuning the trigger blocking safety, how to do it right
  • Smooth means smooth, what happens if you get too aggressive
  • What to leave alone and why
  • Chamfering, what needs it and how much. What to polish the chamber with if it needs it
  • Making it easier to load those shells into the magazine, and what happens if you go overboard

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 owners of any of B. Tyler Henrys lever gun designs and their descendants, 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.