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Posted: 2/24/2013 8:53:31 AM EDT
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I have a trigger in a brand new LMT lower that seems "sticky" to me. It's not a smooth transition as a result of consistent pressure on the trigger. The rifle fires great so far, but the fact that the same amount of pressure leads to inconsistent results in the trigger behavior has me concerned a bit. I'll try to explain more:
As pressure is applied you can feel it give a couple of times before the hammer is finally released on the firing pin and a round is fired. As I said the lower is brand new, so I discovered this on my first live fire with the rifle as I was zeroing it in. I noticed it right away so I spent a LOT of time being careful with the amount of pressure I applied to the trigger before I fired to see if I could get a feel for what was happening. There are two distinct transitions the trigger goes through before the hammer is dropped. I describe it as momentary "give" points where the trigger moves a little bit as I apply pressure. What I don't like is that the first give point where it gives a tiny bit is consistent, but the 2nd one isn't. The second one will happen about 90% of the time, so there will be times where with the same amount of pressure on the trigger will release the hammer a bit earlier than I would expect. Is it normal to have these tiny transitions while pressure is applied to the trigger or should it be a smooth and consistent amount of pressure to release the hammer? My instincts are telling me this might be a break-in thing, or I may need to spend some time lubricating the lower a little more now that I'm going to strip/clean it. Any experience/insights are welcome of course. Maybe I'm being too cautious here (this is my first AR) but I've had a lot of experience with older rifles over the years and how a trigger feels is a big deal... |
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When parts are new they will have machining marks on them. This is a break in issue. Your trigger will smooth out with use. When you strip your lower down for a detailed cleaning, lube the fire control group with CLP oil. Also, put some CLP oil or a light amount of grease on the trigger and hammer sear, and on the trigger and hammer pins to lube them up. Edited for spelling. |
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Trigger pin is parkerized, the inside of the trigger channel is parkerized, and maybe even have a Bur on the ends of the trigger C channels causing some binding problems Trigger not rotating freely on the trigger pin.
So on that note, short of pulling the FCG to polish these parts, its back to break in with the parts CLP lubed until they mate in on their own. And if you do stumble onto one of the basement trigger job mod write ups, do not clip one of the hammer spring leg off!!!!! Yes, you can polish both the pin and trigger channel and even clean up any C edge burs, but if you clip one side of the hammer spring, then it tensions the hammer to once side of the receiver and cause the hammer sear to trigger sear to not self align when the hammer is held back (not to mention that is also reduces the amount of force that hammer is going to strike the FP, which may lead to failed primer ignitions as well). |
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