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3/17/2007 12:25:34 PM EDT
Here's the problem,

I was/am assembling a DPMS lower receiver with a Bushmaster LPK.  Everything went together like butter, I'm thinking this is easier than sh**; then I function checked it.

1.  Verify that hammer locks to the rear when pushed back. -- YES
2.  Verify that hammer pivots forward when trigger is pressed. -- YES
3.  Without releasing the trigger, push the hammer back again and verify that it locks (caught by disconnector). --NO If I let the trigger move slightly forward, the disconnector does engage, and the rest of the fn check passes.
4.  Releasing the trigger should not cause the hammer to pivot fully forward (caught by trigger). -- YES
5.  Hammer will fall when trigger is pressed. -- YES

The disconnector does pivot on the trigger pin, and I used the tapered disconnector spring, and double/triple checked it to make sure I had the right spring.  It just appears that the disconnector does not pivot enough to let the catch on the hammer to slide by it and properly.

Suggestions?


~rj
3/17/2007 12:35:38 PM EDT
[#1]
Take it (the fcs) apart, check for burr's/casting residue, clean/deburr as necessary and try it again.

Slick!
3/17/2007 12:47:27 PM EDT
[#2]
My stock trigger is exactly the same way. May be reading too much literally in holding the trigger back all the way. If I let up a little it works and catches. Not worried about it.
3/17/2007 12:52:04 PM EDT
[#3]
Did you make sure the spring in the disconnector (tapered one) is in with the fat side down and the skinny side up?  I screwed that up on my first build.  
3/17/2007 1:26:11 PM EDT
[#4]
Make sure the selector is installed. The trigger can pivot to far if you try to do the test without the selector in the lower.
3/17/2007 1:30:35 PM EDT
[#5]

Quoted:
Make sure the selector is installed. The trigger can pivot to far if you try to do the test without the selector in the lower.


Ah Haa......thx
3/17/2007 1:40:18 PM EDT
[#6]
height=8
Quoted:
Make sure the selector is installed. The trigger can pivot to far if you try to do the test without the selector in the lower.


DING DING DING DING

we have a winner!

I could not find my long allen key, so I did not have the pistol grip, therefore the selector switch installed yet.

Right after I wrote the initial post, I walked my butt down to the corner hardware store to get a new one (and give my post time to brew).  I got back, finished putting together, and function checked it.  It worked. Then it dawned on me.

Morale of the Story: put the thing together before you worry about it not working.



~rj
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