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Posted: 10/10/2012 7:53:37 PM EDT
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I have a new Knights Armament 2 stage adj. match trigger that has not been adjusted. I followed the KA instructions to the letter and double checked it. Most times it functions flawlessly but once in a while it seems to be far more sensitive. By that I mean sometimes I can feel a little travel before it engages and a little more pressure and it goes bang. Others it seems that there is no travel and it fires with very little pressure. I have been running 55gr .223 and 5.56 but I only notice it on the .223 so far. It could be me in that I have never had a trigger this smooth before. But I have to wonder if it's something in the trigger. Any thoughts? Thanks Nomad6977 see |
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I guess so 007Keith. Most times it feels like the travel on my 1911 where you can lightly squeeze the trigger and feel it stop against tension. Continue squeezing and the it fires. Other times it feels as if there's no travel before the shot. Trigger pull is shorter these times. Maybe I'm just letting the trigger travel far enough forward to reset so there's only the second stage left before firing? |
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Trigger should have some free creep/ take up in it (first stage), then hit the tension wall (second stage),then from there, any further pull should feel like your breaking a glass rod as the hammer is released; followed with about 1/4" over travel of the trigger after the hammer after the hammer.
Note: On a auto rig, you have to dial in a tad over travel on the trigger of you are going to run into doubling problems, where as with a bolt gun, can set the over travel very tight instead. So on this, sounds like the normal like take up is fine, but your having problem with the glass rod break become like breaking a wet noodle instead, If this is the case, then pull the FCG, use a Q-tip to clean the pin channels, a cloth to clean the rods, then using a drill, give the pins a quick short spin in the channels to semi mate the two together/clean up any burs on the channels, then wipe off the pins,clean the channels/pins again, and lube the FCG, including the channels and pins before reassembly the parts into the rig. Also, take a quick look at the primary sear, and above disco hook section (where you get the second stage from). There could be the every so slightest of bur that is causing the strange second stage feeling as well. |
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You have two fixed points with a trigger,
The point where you can set the selector to block the trigger from moving, then the point that the trigger front hook is going to release the hammer from it as the trigger if being pulled back. The second stage (disco contact to the back of the hammer above the hook), should be set so it only makes contract to the above the back hammer hook just before the front hook releases the hammer front it. This give you the increased tension wall of the trigger pull to let you know where the front hammer hook is going to release the hammer, and where to stop pulling the trigger for take up creep. If you don't have creep, or there is not difference between first stage and second stage, then the disc is set to start making contact to the back hammer hook too soon as the trigger is being pulled back. So lets walk the trigger procces from a first shot with the trigger held back. Hammer comes back as the B/C is cycling back, hammer bumps the disco backwards and the disco catches the hammer as it starts to come back up. You release the trigger, and the disco drops the hammer, and the front hook of the trigger catches the hammer. Now as you start to pull the trigger, the front hook is slipping away from the hammer sear, and just before the hammer is released, the disco/back hammer hook makes contract with the rear hammer hook above the back sear just before the hammer is released to create the harder pull second stage (the increase tension wall). From the wall with any more trigger pull, the hammer will be released. And, it's this disco tune/wall set pull that you are trying to dial in correctly. Lastly, you have to dial in some over travel of the trigger after release. What this does is allow the disco to grab the hammer rear sear with the trigger held back to engage the hammer enough to retain it correctly. |
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