AAR SLR15 Law Enforcement Shotgun Armorer, Chamberlain SD


When: January 25-26, 2017

Where: Chamberlain, South Dakota

We conducted a Law Enforcement Shotgun Armorer Course in Chamberlain SD. This course was customized to meet the needs of the hosting agency, and we covered the Remington 870, which is their issued shotgun. The room offered a plenty of table space, as everyone had their own table. There was a very large screen that allowed us to project powerpoint onto, showing close up photos of parts and machining.

We started with an introduction of all present. Everyone was supplied with a course manual, inspection forms, and supplier lists of where to obtain parts, tools and accessories. We supplied every student with their own set of basic tools that are necessary to do most of the general work on the shotguns (short of specialty tools for shell latches and detents, etc). Everyone was introduced and supplied with Slip2000 "EWL" Extreme Weapons Lubricant and #725 Cleaner Degreaser.

We showed our procedure of a series of checks that we use to make sure everything is working correctly, and why we use this series of checks. Everyone was taught a hands on session of the eight basic functioning cycles of the shotguns. From there we broke the same eight functioning cycles down further in greater detail.

We went through the proper way to remove and reinstall barrels. With the barrels removed, they were inspected, in this class I think every barrel was heavily fouled. The fouling inside the barrel is generally plastic from the shot wadding, mixed with powder and shot residue. Everyone was shown that they needed to clean the chamber and bore, as these are different diameters and require different brushes. They were also shown all the other hidden areas of the barrel that need to be kept clean for proper functioning of the bolt assembly and barrel to receiver fit for lock up etc. Also shown were a multitude of tools, brushes, and jags for cleaning the barrel. Everyone with fouled barrels were allowed to clean them, as a hands on session of trying the different methods and tools shows what works better. Everyone was supplied with Slip2000 #725 Cleaner/Degreaser, and Carbon Killer/Cutter, which help to cut through the fouling rather quickly. After a short session of barrel cleaning, the fouling was removed.

Barrels were inspected for damage, stress, missing parts etc. One students 870 barrel had a missing magazine cap retaining detent and spring that was found when we were doing was inspections. This allowed us to not only talk & show the procedure for installation & staking, but it also allowed this one to be repaired by going hands on. We also showed the differences between old and new styles of Remington 870 retaining cap designs, and showed why these shouldn't be intermixed.

We then moved into the bolt assemblies, slides, action bar assemblies, and how they integrate together. Bolts were disassembled and reassembled, and inspections were done, showing where debris and corrosion is found, and why we recommend that certain things be inspected and cleaned on a regular basis. Students were introduced to splined pins, and shown the proper way to remove and install them. The 870's were inspected for old versus new parts, the difference in era's of 870 parts, and shown a hands on difference of forged vs MIM (metal injection molded) parts and why we recommend using the forged parts on police 870's.

Magazine tubes and their internals were gone through. We had people clean the magazine tubes using a magazine tube brush, there was a lot of debris removed, as nobody was aware that there was even such a thing as a magazine tube brush. Magazine springs and followers were covered showing both good & bad. We showed why we prefer tactical magazine tube followers over the stock cup shaped ones. No magazine tubes were found to be bent or damaged.

We removed the forend assembles, stocks receivers and trigger groups. Forend assemblies were taken apart using the proper wrenches, then the foreends were inspected, action bars inspected, and things were reassembled and indexed correctly. Upon inspection, there were two shotguns with loose forends, which was causing cycling issues, these were reindexed and tightened down of which put them back in correct working order. We showed how the action bars have a timing that controls the shell latches, and if the action bars are damaged or bent that the timing could be off. This was a class of Knoxx shotgun stocks. The stocks were removed, which allowed people to do inspections, and check to make sure the receiver stud was in working order. Stocks were then remounted.

We went through the trigger groups. We went through the safeties, rear & front bushing removals and inspections, carrier replacement, connector (action) springs, front & rear trigger plate pin bushings, carrier assembly, etc. We also showed common mistakes that people make with trigger groups, the problems in function, and how to correct any issues. After trigger groups were put back together, we showed how the carriers integrate, how the slides with action bars work, and how/why the lock forward cycle works.

Shell Latches were gone through next. We covered proper staking and why, how they get damaged or misaligned, and their replacement. We demonstrated, and then allowed people to use several different staking tools that we brought. There was one shotgun that had been out of service due to cycling issues, and it was found it needed a new shell latch. We supplied him a new shell latch, and then walked him through replacement and staking, of which it is now back in proper working order.

The last thing we went through was the ejection system. We found that 5 shotguns present had loose ejector springs, and one shot shotgun had a broken ejector track. We showed how to tighten and tune ejector springs, and supervised as these were repaired. We demonstrated how to do an ejector replacement, then we supervised while the shotgun with the broken ejector was worked on, as the old ejector assembly was removed, and a new one was installed.

Then end of the day was a review, followed by all shotguns being reassembled, then inspected to make sure everything was in spec and ready to go back into service.

Here is a brief overview of what is covered:
Headspace and wear inspections
Action and function
Barrel inspections
Fore-end assembly & action bars
Bolt assembly (extraction & spring, firing pin, retractor spring, flexitab cuts)
Ejector inspection, repair & replacement
Slide assembly inspection
Stem adjustments
Hook Space
Magazine spring, retainer & followers
Shell latches, inspections, adjustment & replacement
Custom accessories & enhancements

Greg Sullivan "Sully"
SLR15 Rifles
(763) 712-0123