AGI - Products Marlin Lever Action Rifles - 1894 & 336

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Marlin Lever Action Rifles - 1894 & 336


  • Marlin Lever Action Rifles Models 1894, 1895, 444, and 336

Bob Dunlap understands the design, function, and repair of James Marlins classic lever gun design as well or better than any other gunsmith alive does today. All of these rifles are essentially the same mechanically. The only difference between the pistol caliber 94s and the other guns is the fact that their bolts are square and the right side of the action is open all the way to its rear. They are operationally identical as well and disassemble the same way. Bob uses a cut-away gun to enable you to actually see how the internal parts work together, and their function. If you want the quick course on how to get the Marlin half of the two best-selling rifles in America , the other half being the Model 92 and 94 Winchesters, 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:


  • Discussion of the Marlin, Winchester and Savage smokeless powder designs of lever actions that were all introduced within a couple of years of each other
  • Explanation of the evolution of the Marlins from square bolt to round bolt and the reasons why
  • Square bolt design brought back for nostalgic reasons in 1969 for pistol cartridges
  • Why the Marlin had a huge edge over the Savage 99 and the Winchester 94 when it came to mounting scope sights
  • Quality status of the current manufacture guns vs. the originals

Design & Function

  • Explanation and demonstration of the operation of the locking block and split firing pin safety using a cut away gun
  • Demonstration of the bolt retraction operation and firing pin retraction by the lever
  • Function of the lever detent plunger
  • Explanation and demonstration of the feeding cycle
  • How the front of the carrier serves as the secondary cartridge stop
  • How the lever and the loading gate function as the primary cartridge stop
  • Display of the hammer/sear relationship and interaction, as well as safety notch
  • Operation of the later S model guns cross bolt safety
  • Description of the modern extractor
  • Explanation as to why Bob thinks "The Unthinkable" about this gun


  • Extensive disassembly, parts not removed have removal described, including safety detent screw, lever detent plunger, detent plunger cross pin, and carrier rocker detent plunger
  • Positive and negative extractors described, and which you must have for reliable extraction
  • How the firing pin spring breaks contact between front and rear firing pins
  • How the firing pin retraction by the lever works

Common Problems & Their Solutions

  • Firing pin breakage
  • Mistiming of the carrier, what causes it, and how you fix it
  • Headspace issues and their proper correction
  • Demonstration of the proper way to improve the trigger
  • How to fix the sear if your trigger job went awry

Cleaning & Lubrication

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


  • Making sure you have no parts left over

Common Variations

  • 1894 square bolt disassembled
  • 1895 .45/70 Stainless Steel Guide Gun
  • Final thoughts, and another apology to John Browning
If you noticed how often the terms "explanation" and "visual demonstration" are used, you may be getting some idea of why this course is necessary for any Marlin center fire lever gun 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.