AR Sponsor
Posted: 11/28/2013 7:32:19 AM EDT
| What could cause a failure to fire in a custom build? I've had several times when I pulled the trigger and heard just a click. I cycled the rifle and another click. cycled again and a third click. The rounds had a small dent in the primer. Took the mag out, cleared the rifle, put the mag back in and chambered a round and it ran just fine. I was using an old army surplus metal mag. |
|
Could be several things.
BTW, in your case, the magazine has absolutely nothing to do with the problem. That's assuming that the problem you described, "failure to fire", is not actually a failure to chamber a round. Did you assemble the lower receiver yourself? It's very common to reverse the hammer spring. It'll still snap the hammer up when you pull the trigger, but it just won't have the force to reliably ignite the primer. That would be the first thing I would check. If that isn't the problem, pull the BCG out and disassemble it. Inspect your firing pin for any debris or machining ridges on the part of the shoulder facing the tip of the firing pin. Should be smooth and relatively clean. Inspect the inside of your BCG to see if there are any obstructions (machining or foreign debris that is keeping your firing pin from travelling fully forward. |
|
Quoted:
Could be several things. BTW, in your case, the magazine has absolutely nothing to do with the problem. That's assuming that the problem you described, "failure to fire", is not actually a failure to chamber a round. Did you assemble the lower receiver yourself? It's very common to reverse the hammer spring. It'll still snap the hammer up when you pull the trigger, but it just won't have the force to reliably ignite the primer. That would be the first thing I would check. If that isn't the problem, pull the BCG out and disassemble it. Inspect your firing pin for any debris or machining ridges on the part of the shoulder facing the tip of the firing pin. Should be smooth and relatively clean. Inspect the inside of your BCG to see if there are any obstructions (machining or foreign debris that is keeping your firing pin from travelling fully forward. Thanks. The hammer spring was in backwards. Guess I got in a hurry and wasn't paying attention. I'll get turned around and tested tomorrow. I asked about the magazine because I was shucking some ammo out yesterday and they kept hanging up. Thought maybe they weren't completely cambering. I was using factory Winchester ammo. Will test tomorrow. Thanks!! |
|
Quoted:
Thanks. The hammer spring was in backwards. Guess I got in a hurry and wasn't paying attention. I'll get turned around and tested tomorrow. I asked about the magazine because I was shucking some ammo out yesterday and they kept hanging up. Thought maybe they weren't completely cambering. I was using factory Winchester ammo. Will test tomorrow. Thanks!! Quoted:
Quoted:
Could be several things. BTW, in your case, the magazine has absolutely nothing to do with the problem. That's assuming that the problem you described, "failure to fire", is not actually a failure to chamber a round. Did you assemble the lower receiver yourself? It's very common to reverse the hammer spring. It'll still snap the hammer up when you pull the trigger, but it just won't have the force to reliably ignite the primer. That would be the first thing I would check. If that isn't the problem, pull the BCG out and disassemble it. Inspect your firing pin for any debris or machining ridges on the part of the shoulder facing the tip of the firing pin. Should be smooth and relatively clean. Inspect the inside of your BCG to see if there are any obstructions (machining or foreign debris that is keeping your firing pin from travelling fully forward. Thanks. The hammer spring was in backwards. Guess I got in a hurry and wasn't paying attention. I'll get turned around and tested tomorrow. I asked about the magazine because I was shucking some ammo out yesterday and they kept hanging up. Thought maybe they weren't completely cambering. I was using factory Winchester ammo. Will test tomorrow. Thanks!! Excellent! Glad it was something simple. Have fun with it now! |
|
Quoted:
Thanks. The hammer spring was in backwards. Guess I got in a hurry and wasn't paying attention. I'll get turned around and tested tomorrow. I asked about the magazine because I was shucking some ammo out yesterday and they kept hanging up. Thought maybe they weren't completely cambering. I was using factory Winchester ammo. Will test tomorrow. Thanks!! Quoted:
Quoted:
Could be several things. BTW, in your case, the magazine has absolutely nothing to do with the problem. That's assuming that the problem you described, "failure to fire", is not actually a failure to chamber a round. Did you assemble the lower receiver yourself? It's very common to reverse the hammer spring. It'll still snap the hammer up when you pull the trigger, but it just won't have the force to reliably ignite the primer. That would be the first thing I would check. If that isn't the problem, pull the BCG out and disassemble it. Inspect your firing pin for any debris or machining ridges on the part of the shoulder facing the tip of the firing pin. Should be smooth and relatively clean. Inspect the inside of your BCG to see if there are any obstructions (machining or foreign debris that is keeping your firing pin from travelling fully forward. Thanks. The hammer spring was in backwards. Guess I got in a hurry and wasn't paying attention. I'll get turned around and tested tomorrow. I asked about the magazine because I was shucking some ammo out yesterday and they kept hanging up. Thought maybe they weren't completely cambering. I was using factory Winchester ammo. Will test tomorrow. Thanks!! Backwards hammer spring is by far the most common cause of fail to fire if the rounds are being chamber correctly. Glad it was an easy fix for you. |
| Well, it looks like my problem was tri-fold. First, my trigger spring was backwards. Second, my buffer spring was too long so the bolt wouldn't come all the way back and finally, the gun was dirty as hell from the blow back from the can. The bolt was dragging through the muck. A heavier spring might help that along with a good cleaning. |
AR Sponsor