AR Sponsor
Posted: 11/29/2008 12:05:53 PM EDT
| I think my hammer's riding the bolt in my AR15 occasionally. When it happens, a round chambers successfully, but I have to pull the charging handle, eject and chamber a new round in order to pull the trigger. When I do it, the ejected round has a larger-than-normal indentation on the primer (which makes me think the hammer is pressing on the firing pin when the bolt closes). If I chamber that round again, it has no trouble firing. What can I do to alleviate this? This is my first AR15. |
| The issue's intermittent. I have a Rock River 2-stage trigger. I'm wondering if it could be the ammunition and something weird w/ the bolt. I'm using L&B M193 –– some of the rounds in the boxes have different colored primers and different stampings on the casings. A couple times I've had to use the forward assist when the rounds feed into the chamber. Over about 220 rounds, I had to use the forward assist two or three times and had to cycle a round because of the hammer issues about 5-7 times. |
| Sounds like you have some issues. Is this a build or a factory rifle? I would try to get in contact with somone local that really knows ARs and talk to them. Most people are pretty friendly when the right respect is given. I would not continue to shoot it like it is. I think a slam fire is just waiting to happen, if the hammer is indeed following the bolt. It is obviously not short stroking if it is chambering the next round. |
|
Call RRA or visit the Industry Forum
http://www.ar15.com/forums/forum.html?b=2&f=38 |
|
Quoted:
It's never doubled on me. I'll try a standard trigger. I assume the parts I need are the trigger, the trigger spring, the disconnector and the disconnector spring. Is that right? Correction: "It's never doubled on me YET!" There's definitely something wrong with the disconnector action. Make sure the spring is in correctly (big end down in the groove in the trigger), and make sure the disconnector is free to move. Two things could be going on here: 1. When the trigger is pulled, the disconnector is allowed to pivot up and forward so as to catch the hook on the hammer. If the disconnector is not catching the hook, then the hammer will follow the bolt forward. (This is most likely what's going on.) 2. When you release the trigger after taking a shot, the top-front surface of the trigger pushes the front of the disconnector up, releasing the hammer. HOWEVER, the front of the trigger must be high enough to catch the sear notch on the hammer. If it doesn't catch the hammer, then the hammer will fall again when you release (reset) the trigger. It sounds like you have a problem with number 1. If your problem were number 2, you would get one shot when you pulled the trigger and a second shot when you released it. Regardless, it should be your TOP PRIORITY to get this diagnosed and fixed before you go to the range again. Like was said earlier, if your rifle should double, and the wrong person is there to witness it, you could be looking at an expense-paid vacation at the Graybar Hotel. BTW, after you've "dry checked" the action without ammo, the rifle should then be tested at the range, with known good ammo, as follows: First, load one round in a magazine, chamber it (with the muzzle pointed downrange in a safe direction), and fire it, holding the trigger back after the shot goes off. Observe that the round fires and ejects, and the bolt should lock back. When you release the trigger after the shot, you should hear a distinct "click" as the trigger resets with the hammer notch catching the trigger sear. Next, release the bolt on an empty chamber, then pull the trigger again to make sure the hammer was being held by the sear. Next, load two rounds in a magazine, chamber, and fire them, each time holding the trigger back after the shot and listening for the reset when you release it. Make sure you get only one bang per pull of the trigger. By loading only two rounds, if the rifle doubles or goes full-auto on you, you probably won't loose control with only two rounds, as you might if it did an unexpected 30-round mag dump. It it doubles, cease firing until you get the rifle fixed once and for all. |
|
I forgot to bring my digital camera out here where I'm staying. Excuse my terminology; please correct me if I'm using the wrong name for any parts.
I noticed that i have the spring for the hammer resting on the pin that goes through the disconnector. I've never dry fired the lower by itself, but I've played with the hammer with my thumb on it, taking care to not let it slam into the receiver. When I attempt to reset the hammer, I notice that it takes significantly more pressure for it to lock back into place. I'm thinking that what's happening is that there is either A) too much clearance from the bottom of the bolt carrier or B) the hammer does not always have enough momentum to lock into place with the trigger. I'm guessing that this extra effort to lock the hammer back is the opposite of the action you feel in the 2-stage trigger. This is my first AR15; I've never worked with any setup other than the one that I have. This first happened to my friend that was shooting the gun. I assumed that he felt the hold point of the RRA trigger and just wasn't squeezing it hard enough. |
AR Sponsor