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Posted: 6/27/2011 5:26:18 AM EDT
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Hi guys… noob here so forgive my cluelessness!
I ran into an issue today while firing my 1st rifle build for the 1st time. It’s a DPMS .223 build and as per their barrel break-in procedure I fired the 1st 10 rounds and cleaned the barrel and chamber after every round. Everything ran smooth and nothing blew up – yay! My rifle cycled fine but I only had one round in the magazine for each shot. After that I loaded 10 rounds into the magazine with intentions of firing them consecutively. The 1st round fired no problem and the rifle cycled just fine… but when I pulled the trigger to fire the second round the trigger wouldn’t move – it was as if the safety was engaged...? Yes, the safety selector was on fire! Anyways I moved the safety selector to safe and then back to fire and pulled the trigger – boom there went the second round. The rifle cycled fine but again when I went to pull the trigger it wouldn’t move… and again, I switched selector to safe and back to fire and it fired just fine. What did I do wrong??? Rifle has: DPMS lower, DPMS lower parts kit, DPMS 2-stage trigger, DPMS everything else. Did I install the 2-stage trigger incorrectly? It dry fired ok and live fired ok… and yes there is a definite 2nd stage! Did I install the safety selector incorrectly? Didn’t think one could do that. Did I receive a left-handed selector and install it right-handed - is that possible? Any help would be appreciated... please and thanks! -Richard |
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Sounds to me like the disconnector isn't letting go of the hammer ... when you move the selector it pushes down on the trigger housing and causes the disconnector to release the hammer.
Try the FCG function test .... pull the upper off the lower .... cock the hammer back and pull the trigger (make sure to catch the hammer ... don't let it slam into the upper) keep the trigger pulled while you recock the hammer and the disconnector should catch the hammer ... now release the trigger ... the disconnector should release the hammer to the trigger sear if it doesn't and the disconnector holds onto the hammer you have a disconnector timing issue. |
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Gatorhunt,
Ok thanks, I did as you said. When I keep the trigger pulled and recock the hammer the trigger stays in the retracted position and the disconnector won't' release the hammer. I assume this confirms your suspicion of a disconnector timing issue. My next dumb question would be: what now? Is this something I can easily fix or should I just call DMPS and return some parts? Thanks! |
| If it's a 2 stage trigger it may just need to be adjusted ... I'm not familiar with the DPMS 2 stage triggers (or if they have their own or use someone else's) but usually they have set screws that will adjust the take up and over travel of the trigger ... if your not familiar with 2 stage triggers or how to adjust them then you will need to either send the lower back or find someone that can adjust it correctly. There is also the possibility the disconnector itself will need to be replaced or modified to correct the timing but I have no way of knowing which needs to be done without seeing it. A good smith could diagnose and correct it relatively quickly. |
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Quoted:
Another good reason to stick with the stiff old sandard stock trigger setup. I general I would have to agree with this statement ... but I have had this issue even with a standard FCG a couple of times ... it was mostly due to poor manufacturing of the parts though. 
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| then buy a Spikes unit, Never had a problem....I did have one unit that the bolt for the pistol grip was hitting under the safety and I backed up two turns everything ran fine so i installed another washer with the other one and things are fine... I would have just ground the screw but once it worked I left it alone.... |
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