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[ARCHIVED THREAD] - xm193 not firing

Posted: 3/12/2006 2:44:41 PM EDT

Just took my first build out for a test run with serveral types of ammo and had 1 in 3 fail to fire with some federal xm193. All the american eagle 55 grain stuff and the winchester white box fired fine. I had primer dents on the xm193 and 1 or 2 fired the second time but the rest would not go off. The wolf also shot fine when it wouldn't fail to feed. Is it a problem with hard primers on the federal or do I have a weak hammer spring.

Posted: 3/12/2006 2:53:05 PM EDT

[#1]

For a first build project, verify the hammer spring is installed correctly (not backwards, legs on top of trigger pin).

Posted: 3/12/2006 2:59:58 PM EDT

[#2]

Hammer spring is sitting on top of trigger pin.

Posted: 3/12/2006 3:28:30 PM EDT

[#3]

Is this a stock tirgger or is it a match type?

Posted: 3/12/2006 4:00:57 PM EDT

[#4]

stock trigger set

Posted: 3/12/2006 5:44:26 PM EDT

[#5]

Chamber 5.56 Nato, and not 223?

With the shorter 223 chamber, it would explain the reason it chambers/locks up on the shorter rounds, and will not lock up on the longer 5.56 Nato round.

Regarding primer denting during hammer strikes to the FP, are you getting good strikes/dents, or just little dimples on the surface of the primer?

Read this to make sure that the hammer spring is installed correctly,
www.ar15.com/forums/topic.html?b=3&f=66&t=241858

Posted: 3/13/2006 3:41:13 AM EDT

[#6]

Quoted:
Hammer spring is sitting on top of trigger pin.

Is the spring on backwards? That "loop" should be on the back of the hammer (facing the shooter). When cocking the hammer, the hammer spring should be "compressing" in the direction of the windings.

A backwards hammer spring may have the loop in the front or back, but with the coil spring stretching out as you cock the hammer.

Posted: 3/13/2006 1:00:00 PM EDT

[#7]

Figured it out . I'm dense. thanks guys

Posted: 3/13/2006 4:19:39 PM EDT

[#8]

Quoted:
Figured it out . I'm dense. thanks guys

Was the hammer spring on backwards? You can tell us - it'd also help out anyone in the future who may stumble upon your thread experiencing the same problem.

Posted: 3/14/2006 2:01:57 AM EDT

[#9]

Hammer spring was flipped around.

Posted: 3/14/2006 2:45:16 AM EDT

[#10]

Quoted:
Hammer spring was flipped around.

I'm glad you found the problem!

[ARCHIVED THREAD] - xm193 not firing

AR-15 » Troubleshooting

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