AGI - Products H&K, CETME, & G-3 Rifles

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H&K, CETME, & G-3 Rifles


H&K, CETME, and G-3 Rifles

Bob Dunlap is a renowned expert on most of todays and yesterdays important AND obscure firearms. He has been a warranty station for most manufacturers, both large and small. His understanding of the design, function, and repair of firearms in general is unsurpassed, and his appreciation of European and exotic arms is legendary among his students. The H&K series of roller-locked military assault rifles and their semi-auto counterparts were an extremely successful evolution of a Polish idea, brought to fruition by both the Germans and the Spanish. The guns have been imported to the U. S. in big numbers since the mid-80s. This course is designed to help all of you owners who love the gun, but are a little mystified about its workings. In typical AGI fashion, we use a cut-away gun that allows you to actually see how the various parts work and interact.

If you want the quick course on how to get this Teutonic meisterwerke rifle 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:


  • The Wehrmacht found the original roller locking design in the Radom plant in Poland after they invaded. They liked the design as well as Bob does. They developed the system and used a forebear of the current system in the G-43.
  • The Germans had some problems with the gun involving headspace and tearing the rims off. The design engineer in charge of the project decided to take a vacation in Spain to relax and clear his head. He got so relaxed he did not go back home
  • After the war he went to work for the Spanish CETME group and continued to develop the rifle
  • SIG in Switzerland and Heckler & Koch in West Germany were also working on the design
  • CZ-52 uses roller locking as well, but not delayed blowback
  • System does not require a bunch of stuff like pistons, gas tubes, etc., hanging from the barrel, all forces are in a straight line so the guns tend to shoot well (accurately)
  • See the chamber fluting, and why the system tends to be self-cleaning
  • System also tends to compensate for cartridge length variances (headspace)
  • Roller locking system seems to be becoming pass
  • Guns seem to have less recoil than other systems

Design & Function

  • Roller locking system described and shown
  • How the system compensates for varying cartridge lengths
  • What controls headspace, and how to cure excessive headspace
  • Why you probably should not do it yourself
  • Why the extractor of a roller lock rifle needs to very robust, and why its hook must not be negative
  • The fire control group is very much like that of the .30 M1 Carbine
  • Demonstration of how the sear moves fore and aft, as well as rocks, and explanation as to why
  • Demonstration of how the sear works as its own disconnector
  • Since the safety only blocks the movement of the trigger, it is not positive. How it can be overridden if the system is negative
  • Demonstration of the ejection cycle, how the rearward movement of the bolt raises the ejector, and why the ejection is so violent
  • What mashes up the brass
  • Demonstration of the locking system in the gun with the carrier locked up
  • Why this gun does not have a standard style operating handle attached to the bolt or carrier
  • How the camming action of the operating handle releases the bolt and carrier from engagement
  • Why the locking system can go 150,000+ rounds without appreciable wear but the sheet metal receiver will develop stress cracks


  • Extensive disassembly, and instructions on how to take apart those parts/assemblies not disassembled, such as the recoil spring guide and operating handle. Parts not removed have the reason for that explained
  • Field stripping the gun
  • Operating handle details
  • Magazine catch and rear sight details
  • Bolt assembly, rollers, and extractor
  • Spare parts
  • Safety features and firing pin
  • Trigger group details, how to take it apart, but why you probably do not want to
  • You get a good look at how the various parts fit together and interact (particularly the springs) as Bob explains things

Cleaning & Lubrication

  • AGI cleaning & lubrication methods shown, along with the reasons for their use
  • Ejector disassembly
  • Cleaning
  • Lubing the Bob way, and what kind he likes
  • Trigger housing reassembly
  • Bolt reassembly
  • Bolt carrier reassembly
  • After cleaning, dry with air gun, or in the oven on Warm ~185-200 degrees (metal parts ONLY)


  • Bolt insertion
  • Forearm assembly
  • Trigger housing insertion
  • Buttstock assembly
  • Final thoughts


  • Magazines
  • Scope mounts
  • .22LR conversion
  • Accessories overview

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 CETME, H&K, or G-3 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.

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