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Posted: 6/14/2013 9:09:03 PM EDT
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I have read some threads about trigger jobs, but the question has not been answered in any of the threads.
The question: Is it normal for the hammer to move rearward when pulling the trigger? Bushmaster M4A3 carbine. When I shoot this rifle the trigger is terrible. I removed the upper and watched as I squeezed the trigger and the reason I think its so hard to pull is that it moves the hammer back having to overcome the hammer spring. Forgive me if this is a stupid question. Thanks |
| its fine.....even my xd's, mp's etc... do this. it helps keep the gun from going off if it gets dropped (2 flat surfaces wont do much for dropping a gun, but if the surfaces are angled the forward pressure from the hammer keeps the trigger pulled forward). also helps "reset" the trigger if you only do a partial squeeze but never send a round down range. |
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its fine.....even my xd's, mp's etc... do this. it helps keep the gun from going off if it gets dropped (2 flat surfaces wont do much for dropping a gun, but if the surfaces are angled the forward pressure from the hammer keeps the trigger pulled forward). also helps "reset" the trigger if you only do a partial squeeze but never send a round down range. Thanks for the help. I guess if there is no snags/gritt feeling during this, then polishing will not help much. Maybe ill just buy an aftermarket trigger. |
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The jp springs help with the pull. I got the 3.5lb springs from Midway, I also used some CLP and 1500 grit sandpaper on the standard dpms trigger I have and it helped with the "gritty" feel. Thank you for the advice. I should probably do this and intentionally ruin them so I can buy the aftermarket set 
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you can try the JP springs, havent tried em myself but they drop the trigger weight some. DIY mod is bending a leg of the trigger spring. i wouldnt reccomend either of these mods for a duty/HD gun though. http://www.jprifles.com/1.4.8.3_spring.php I checked them out at the link you provided. Not bad pricing if you consider what they accomplish. Thanks |
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AR stock trigger units almost have to allow the hammer to move backward when the trigger is pulled, because if they don't, the trigger will not reset if you release the trigger before it drops the hammer.
This would leave you with either a very light trigger pull the next time, or an unsafe trigger that might allow a bump to drop the hammer. After years of playing around with stock units, I finally decided the smart move is to just replace the entire thing with an after market unit. If you do a LITTLE honing of the trigger and hammer, or if you just use it until it self-burnishes you will get a much less gritty trigger, but still not what many people want. The advantage of the stock unit is that it's pretty much bullet-proof and you shouldn't have to ever worry about a malfunctioning unit like you do with after market units. My opinion, is that an adjustable trigger or a Match type unit has no place in a rifle that's not a target rifle. For a "battle" or defense rifle an adjustable or Match type trigger unit greatly increases the chances of a malfunction that can cause an accident or a rifle that suddenly doesn't work when you need it to. One trick I found that does smooth the trigger without the risk of stoning or taking forever to self-burnish, is to totally remove all lubricant from the hammer and trigger, put a pad between the hammer and the receiver to prevent battering the receiver or bolt stop, and just dry fire the trigger 50 times. This will burnish the unit without the risk of stoning breaking through the surface hardening. Brownell's sell a special hammer-receiver pad to allow dropping the hammer without damaging anything. Once the trigger is burnished, apply a thin coat of grease to the hammer and trigger interfaces. This will give about as good a trigger pull as you'll get on the AR and still be safe. |
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Quoted:
Quoted:
The jp springs help with the pull. I got the 3.5lb springs from Midway, I also used some CLP and 1500 grit sandpaper on the standard dpms trigger I have and it helped with the "gritty" feel. Thank you for the advice. I should probably do this and intentionally ruin them so I can buy the aftermarket set
Haha.. do whatever you want but in my case the 1500 grit paper and CLP actually helped get rid of the "gritty" feel. You'd probably get better results with some 3000 grit paper. Besides It's a dpms trigger, how worse could it get? Edit: and I didn't sand much. In fact very little. |
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Quoted:
Quoted:
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The jp springs help with the pull. I got the 3.5lb springs from Midway, I also used some CLP and 1500 grit sandpaper on the standard dpms trigger I have and it helped with the "gritty" feel. Thank you for the advice. I should probably do this and intentionally ruin them so I can buy the aftermarket set
Haha.. do whatever you want but in my case the 1500 grit paper and CLP actually helped get rid of the "gritty" feel. You'd probably get better results with some 3000 grit paper. Besides It's a dpms trigger, how worse could it get? Edit: and I didn't sand much. In fact very little. That post was an attempt at humor by me. It probably wasn't very funny, but I do really appreciate the advice. Im actually taking apart the gun now to clean it. I may go ahead with an attempt at polishing it. I see it talked about in a few threads here that you don't want to go through the heat treated tempered part of the components. I also see some guys saying that you cant go through that part unless you remove a lot of material. Having never messed around with those parts im not sure. I would think if you took so much material off that it went through the heat treated layer, the parts would be useless from all the material that was removed. Thanks again! |
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I understand that not everyone is mechanically inclined.. but for me it was a 5min $10 fix that (to me) worked really well without spending $230 on a gieselle. Im actually very mechanically inclined. I have been working in industrial maintenance for about 15 years. When you want to know something about a particular thing, its best to ask someone who has already had experience in that subject. That's the reason I asked you 
Peace |
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