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The first published study of the Walker-Haskell trigger patent, how the trigger works, how it fails, how to fix it and how to test it.
   REMINGTON-WALKER TRIGGER EXPLAINATION   INTRODUCTION-- This paper is published as a public service aimed primarily at gunsmiths and advanced amateur gun enthusiast that have a curiosity about the fascinating mechanics involved in modern firearms and are willing to look at very easy facts and features and figure out how it works. Remington-Walker triggers are more complicated than pliers, but not by much. Much of their mystery remains because the design is so like others in appearance, but totally different in operation.The author has a life-long love affair and intense interest in what makes guns do what they do and how to make them do it better by design instead of blind luck. For the past seventeen years much of the gun study has been as a the result of law suits involving firearms and their design. t has been an enlightening e!perience that needs to be talked about. "m in no way picking on Remington but they"re in the spot light right now and actual facts are hard to come by on this sub#ect. "ve testified as an e!pert in Federal and other courts in civil and criminal matters in several states. My testimony has never been disallowed. There is a difference between studying design and function by taking things apart and comparing what is seen by a parts diagram and testifying to how the gun operates to a great degree of mechanical certainty. When testifying of how something happens certainty  is essential. The rule of "follow the forces" in gunsmithing is a good one. $nce forces and pivots are seen and understood, the entire trigger is no longer a mystery. %ust because it looks like any other trigger is no cause to think it operates like any other. t does not.&ttacks on the author by those that have not read this paper while actually e!amining a Remington-Walker trigger and the patent language pertaining to it will be happily ignored. Facts are facts and "m trying to e!plain how to actually see those facts so you can come to your own conclusions based on mechanical knowledge instead of what was heard said somewhere.'verything written here is e!pected to land in opposing attorney"s offices in less than ten minutes after  posting to be studied and e!amined and preserved for future use while "m under oath. There are cases  pending and testimony still to be given. For that reason if no other, you can believe what  say here...not in deer camp, maybe, but this is verifiable truth backed by e!perience, sworn testimony, documents, photographs and video tapes are on the record. t is ($T my intention, whether on purpose or by accident to reveal any protected documents or facts not already in the record and available to anybody that can use a search engine. There are supporting documents, but you"ll have to find them elsewhere. "m talking strictly mechanics for mechanics and using the )* +atent to show the inside workings of a sealed unit ordinarily not seen.uestions on this paper are gladly answered but preferably in the public forum. The purpose is, after all, the education of a sub#ect out of normal vision and e!perience of the shooter. f you want to talk  politics or personal appearance or what you think of me or something else, please move it to another thread. This discussion is about one particular family of triggers that are present on more than seven million rifles spread all over the world. Remington-Walker-askell trigger---  +lease reference ).*.+at.   ,/01,230 That"s the trigger we"re talking about and it"s different than all others. There are pdf download patents available without charge several places on the internet.To fully understand the operations and failures of the Remington-Walker trigger the drawings and the te!t of the patent is M$*T important. +rint it out, if possible, for ready reference. t is the heart of the Remington "problem" in 455 and 655 series triggers. This applies to all models but   the M-633 which has a one piece trigger design in it.The patent drawings are probably different than the trigger you see in your rifle. $ver the decades many changes have been made to the various parts. "ll e!plain the differences and what effect they have on operation and safety, later, but here"s a rough test to see which "generation" trigger is in your rifle.Remove the bolt and look down in the rear tang at the  sear  . f there is a stack of four parts, the outer housing and the two sears, it"s an early gun and should be treated with special care. The more modern sears are chromed, sintered metal and of one piece. The second test is to see if it has a bolt lock safety. 7oes the bolt open easily with safety $(8 f so it was made after 023. f you have a bolt lock gun, cut the lug off so it"s defeated. %ust grind off 9: Fig 0 of the patent. f the face of your trigger is smooth without the ridges commonly found on the face of triggers, it is a new ;-Mark+ro trigger that has a solid trigger and no connector. t was made after $ctober of 554.  have closely e!amined several ;-Mark +ro triggers and their prototypes. t is as good as any trigger on the market and better than many. t"s #ust 45 years late. With those comments "ll dive into a sub#ect  e!tensively covered on this site and others ten years ago. That fact that the plane you're flying in has not crashed is no evidence that crashes don't occur. That pretty well sums up anecdotal evidence. %ust because your rifle"s trigger has never, ever done anything but what you directed it to do is no evidence of the lack of a defect. t"s there and it"s unpredictable and many times it won"t repeat no matter what you do. The scientific method depends on masses of information when the occurrence is rare and non-repeatable. There are thousands of people that have written letters of complaints that describe the e!act same failures time after time. The defect is in the trigger and #ust because it works now does not mean it won"t fail in the future.  Basics-- The Remington-Walker trigger is an <$ver-ride= trigger system. That means it"s not a <7irect-acting= trigger that  pulls the sear   out of position with the cocking piece >like M-23, 5:, etc?. &n over-ride trigger  props up the sear   and is not attached to it. Winchester started the over-ride, or "negative angle" trigger in hunting rifles in the M-65 in 02:6. *ako made an override trigger contained in a housing that was then fastened to the action. Many custom trigger makers copied it #ust after the War. Timney, 7ayton-Traister, @an#ar, %ewel, Ruger M66, &-bolts, Tikka. %ust name a modern bolt action rifle and it"ll have an over-ride trigger in it. They are crisp and allow very good trigger pulls. They are the "standard" in modern bolt action rifles.The Remington-Walker is different   than all those others and patent 9,/01,230 tells us why that is.  Figure 0 of the patent shows a #umble parts that usually makes people slightly ill to try to cipher it out. ere"s a better representation with the parts labeled in common language and direction of movements given to hopefully, though crudely, better "see" what"s inside. (otice the area inside the red circle. When the bolt closes, the cocking piece pushes the rear of the sear downward so that the sear rest on the rear corner of the connector. That overlap is the "sear engagement". ts usually .503 to .5/ inches which means the rifle is prevented from firing by about .551 sAuare inch of steel, at most. n this position, the cocking piece is held by the sear, which is  pressing down on the top of the trigger-connector. When the trigger moves forward the sear falls and the firing pin rushes forward to fire the rifle.The safety cam lifts the sear off the top of the trigger-connector and locks the sear into the cocking  piece so the gun can"t fire, but the trigger and connector are free to move. When the safety is rotated to $FF, the sear comes back down on the trigger-connector. This is a simple "*ako-style", modular, over-ride trigger. The fact that the sear is hinged at the front instead of the back makes no practical difference. t can be seen by this simple motion of the safety and sear that the trigger-connector &B' to come back to the full rear position for there to be security in the sear C trigger engagement.n it"s simplest form, an over-ride trigger is two levers and two springs and two retaining pins. The M-65 is e!actly that, plus an over-travel ad#ustment. The "*ako style" over-ride triggers, contained in a housing have more parts, but their actions are e!actly the same---The trigger props up the sear and when the sear is allowed to fall the gun fires.n the Remington-Walker trigger, the safety "problem" is ($T in the safety. This is a common  misconception but it"s important to realiDe the Remington-Walker  safety  is not the cause of firing without a trigger pull. The safety could be called a "victim of circumstance" in that it is converted to a trigger   without the shooter"s knowledge.ow does it do that8Eet"s take a look at some patent language, shall we. o to page :, beginning on line 45 and read through to +age 1, line 40. This description has several parts and pieces that needs e!amination. t starts by telling how the connector (  you"ll hear that word a lot? is not fastened inside the trigger housing, but "fle!ibly mounted" in it. That means it"s loose on the trigger but for the trigger return spring pushing against it. & lot of the verbiage describes nifty ways of making the housing out of a stamping, but that was discontinued many years ago. +age 1, line  through 15 is where it gets interesting to an e!perienced shooter.< This stop screw provides an adjustment to positively stop trigger movement just as the sear is released and makes possible the complete elimination of undesirable trigger slap or overtravel.” +age 1, line 15 starts a section that needs to be e!amined very closely : “ f we e!amine the functioning of the unit" we will observe that the trigger and connector move as a unit"...” and line 11, “#t this point the trigger stops but the connector $.”  old on, right there. Eet"s read that again and make *)R' you know what that says, then try it on your )(E$&7'7 rifle. 7oes the trigger stop it"s motion as the sear drops off of it8 f it does, the patent makes sense. The operation of the connector would shorten the overall travel of the trigger to only the amount of the sear engagement and nothing more. Gut, if the trigger is going to travel until it hits the stop screw anyway, why complicate the trigger with a part that has no benefits8 The amount of motion in the trigger is as little as it can be made if the corners are sAuare and the sear falls cleanly from the corner of the trigger.';+'RM'(T-- Take any unloaded, bolt action rifle with an over-ride trigger in it >anything bolt-action and civilian?. With the rifle uncocked and bolt closed carefully pull the trigger several times and note how much that movement there is. t"s usually about .55 inch or about two thirds the thickness of a credit card. What the patent is saying is that the trigger does not move that .55 after the sear trips. t says the trigger  stops  when the sear trips. That, of course is demonstrably not true. Try it on any rifle. The trigger "follows through" as the gun fires. Hou can"t stop it short of the stop if you wanted to. *o, what are we left with8 )sing .55 inch as the sear-trigger engagement figure and assuming the pivot pin is near the center of the trigger, it can be said the trigger pull is .55=, plus a clearance after disengagement to allow the sear to fall without touching anything. @all the total trigger movement .5:5 inch when the trigger pull plus overtravel is figured. Gy actual e!periment you can see that the movement of a Remington-Walker trigger is e!actly the same as any other trigger having the same sear engagement and the nonsense on  +age 1, line :5 does not apply. “...for it is not practicably possible to produce and maintain absolutely sharp s%uare corners on the engaging surfaces of the sear and conventional trigger.”  (obody says that an absolutely sharp sAuare corner is needed to make a good trigger and everybody  but Remington has done so.*o, why the connector8 f the connector really doesn"t do  anything, why have it8 s it cheaper than say a heat-treated trigger by any other maker8 +ossibly, but others have solid triggers. 7oes it, in &(H way, make the trigger a "better" trigger8 (o, it"s #ust different. t does not reduce the trigger movement at all but it"s different simply because it"s more complicated. t seems to be the perfect e!ample of a new design patent as the result of one little change to something invented prior. n this case, the improvements and attributes said to be present in the Remington-Walker don"t perform the function claimed in the patent. The change in the trigger design was for the purposed of a patent and not for performance.$peration--&n over-ride trigger must, absolutely M)*T, return to full position after every shot. The trigger return spring is there to do that #ob. That"s the spring you feel in the trigger when the rifle is not cocked. & trigger that does not return to the proper position reliably under the sear is more likely to fire without the trigger being pulled. That is simple physics and easily set up in demonstration. <Return to battery= for internal trigger parts is part and parcel of over-ride trigger operations. The Remington-Walker"s "trigger" is not the piece you put your finger on. The part that acts as the trigger under the sear is actually the connector which is "fle!ibly connected" to the trigger body. The trigger return spring pushes the connector which then pushes the trigger body into position under the sear. The connector offers a complication that is not needed in the trigger. The addition of the connector only adds to the comple!ity of what is a very simple and amaDingly reliable mechanism when it"s parts are limited to only what"s necessary to do the #ob.s a mechanism that"s called upon to return one lever with one spring more reliable than a spring  pushing on an intermediary part and then the lever8 $f course it is. The fewer parts, the simpler the mechanism, when dealing with simple levers.With the re-positioning of the trigger-connector reAuired after each shot in the presence of recoil and  powder residue and debris the answer becomes even more certain. More parts means more complications without benefits.$W 7$ T'H F&E8Remington-Walker triggers are sub#ect to several failures all due to displacements of the connector inside the trigger housing. These failures are common enough to have acronyms for themIF*R-- Fire on *afety Release.ow many people have pulled the trigger with the safety $( #ust to "test" it out8  know of hunter safety instructors that teach  it as a good thing to do every time the safety is applied. ow many times is the trigger pulled while the safety is $( but not by the shooter8 That"s probably a rarer occurrence
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