User Panel
User Panel
User Panel
|
Posted: 5/24/2015 8:14:22 AM EDT
[#1]
Quoted: Pistol is an M1991A1 with a slightly modded 1911A1 hammer for a smoother trigger squeeze. I've fired about 3,000 rounds without issue since putting that hammer in. I give it a good cleaning every 300 rounds or so, but the most recent one was a couple weeks ago. After assembling, I function checked it and discovered this malfunction. I field stripped it, looked for any missing or misaligned parts, put it back together, and the safety and hammer still drop. Do I just need to swap back to the stock hammer, or is something else going on? 1. You have the manual thumb safety in the up position? 2. You are pressing against the beaver tail or grip safety when this happens? 3. No trigger press, but you pull hammer back and it will fall and release the safety? |
|
|
|
Posted: 5/24/2015 8:37:30 AM EDT
[#2]
I think you answered your own question in the first sentence !
What does a slightly modified hammer for a smoother trigger mean ? 99% of the time this is means someone screwed up the job.. Obvious... Swap out the Hammer and see if the problem remains. We're other parts.... Smoothed out ? The sear may now be bad as well. Edit: 3K rounds... A marginal Trigger job ? Maybe..Possible that who ever did the job did an ok job but did not get it just right and you had excessive wear caused by the mating surfaces not lining up as perfectly as they should and you now have wear (rolled edges) in several places. When it goes full auto..you will know ! Edit 2: hammer pin ? Does it have lots of wear or grooved ? |
|
|
|
Posted: 5/24/2015 9:08:36 AM EDT
[#3]
Modified "Series 70" hammer in a series 80 gun?
|
|
|
|
Posted: 5/24/2015 1:23:55 PM EDT
[#4]
Personally, I would think your thumb safety is worn out, but I don't know how it would wear out
 A propperly fitted safety fits firmly against the sear when engaged. The engagement surface would have to be shaped wrong, like a ramp so that when the sear pushes against it it moves to the off position. Also is the detent spring still good and firm?
|
|
|
|
Posted: 5/24/2015 8:02:43 PM EDT
[#5]
Quote HistoryQuoted: Okay first lets go over how everything works: 1. You have the manual thumb safety in the up position? Yes. 2. You are pressing against the beaver tail or grip safety when this happens? Yes. 3. No trigger press, but you pull hammer back and it will fall and release the safety? No. |
|
|
|
Posted: 5/24/2015 8:08:44 PM EDT
[#6]
Quote HistoryQuoted: I think you answered your own question in the first sentence ! What does a slightly modified hammer for a smoother trigger mean ? IIRC, the sear surface was sharp, but not as deep and resulted in less creep. Obvious... Swap out the Hammer and see if the problem remains. We're other parts.... Smoothed out ? The sear may now be bad as well. Other trigger bits are stock. Edit: 3K rounds... A marginal Trigger job ? Maybe..Possible that who ever did the job did an ok job but did not get it just right and you had excessive wear caused by the mating surfaces not lining up as perfectly as they should and you now have wear (rolled edges) in several places. Quite possible. When it goes full auto..you will know !  Edit 2: hammer pin ? Does it have lots of wear or grooved ? Don't think so. |
|
|
|
Posted: 5/24/2015 8:13:05 PM EDT
[#7]
Quote HistoryQuoted: Modified "Series 70" hammer in a series 80 gun? The half-cock function is no more, but when I put it in, everything else worked fine. |
|
|
|
Posted: 5/24/2015 8:24:06 PM EDT
[#8]
Quote HistoryQuoted: Personally, I would think your thumb safety is worn out, but I don't know how it would wear out A propperly fitted safety fits firmly against the sear when engaged. The engagement surface would have to be shaped wrong, like a ramp so that when the sear pushes against it it moves to the off position. Also is the detent spring still good and firm?This is what I was thinking. My trigger finger says the detent takes about 8 lbs to overcome. I consider it a solid, but not difficult click. |
|
|
|
Posted: 5/24/2015 8:28:20 PM EDT
[#9]
Later tonight, I'll take it apart, examine the surfaces, and put the stock hammer back in if something else isn't obviously wrong.
|
|
|
|
Posted: 5/24/2015 10:38:10 PM EDT
[#10]
put it all together as normal minus the grip safety. then just look inside and see whats happening.
|
|
|
|
Posted: 5/26/2015 12:14:21 AM EDT
[#11]
Quote HistoryQuoted: put it all together as normal minus the grip safety. then just look inside and see whats happening. I did this. It seems like the bottom of the trigger sear is allowed to move about 0.030", which is enough to release the hammer and simply smacks the safety out of the way. I referred to frame one.  The hammer sear is sharp, and the thumb safety has a big shiny spot where the bottom of the trigger sear contacts it. I think that's the culprit. |
|
|
|
Posted: 5/26/2015 10:12:56 AM EDT
[#12]
It seems like the bottom of the trigger sear is allowed to move about 0.030" Should be zero. |
|
|
|
Posted: 5/26/2015 6:47:12 PM EDT
[#13]
Quote HistoryQuoted: Should be zero. Quote HistoryQuoted: It seems like the bottom of the trigger sear is allowed to move about 0.030" Should be zero. Yip. I also changed the trigger sear, but forgot.  Bullseye league tonight was cancelled due to weather, otherwise I'd see how much of a difference the stock sears make. I don't feel much of a difference now, but at the time, my confidence needed a little boost - "special tires" so to speak. |
|
|
|
Posted: 6/2/2015 11:46:48 PM EDT
[#14]
Got to shoot tonight. The stock sears took some getting used to.
My 3 previous nights averaged 700/900 points. Tonight I got 670 due to the creep during slowfire. |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
