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Posted: 8/6/2010 2:15:59 PM EDT
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I just installed the trigger group. At first the disconnector wasn't catching the hammer (it was just barely catching it but not enough to hold it). I noticed that the disconnector was sticking if you pushed down on the back of it. After working the disconnector up and down several times, everything seems to function as it is supposed to (i.e., the disconnector catches the hammer when the trigger is pulled and held and the hammer is recocked). However, the disconnector is still somewhat sticky. If you push down hard on the back of the disconnector with your finger it sticks in place.
The disconnector spring is not installed upside down. The flared larger end of the spring is in the holed-out area of the trigger, and the smaller end is on top for the disconnector to press against. |
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I see the problem. The disconnector and the trigger don't fit together right. The disconnector is too thick, or the channel in the trigger is too narrow, or both. I disassembled the trigger group and tested the two parts together without the disconnector spring in place; just the trigger, disconnector, and trigger pin. The back of the disconnector sticks into the trigger channel when you press down on it.
It would have been nice if the folks at Specialized Armament Warehouse would have checked the fit of those two parts together before shipping them out. A sticky disconnector could be dangerous, resulting in full auto if used with soft-primered ammo (due to "hammer follow") and 30 months in the pen (like David Olofson). You can see a video of the problem here (make sure the sound is on) - here. |
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Quoted:
Did you let SAW know there was an issue? Yes I did. I heard back from Mark at SAW today. There was a delay in replying because they just got through with a week-long ATF compliance inspection (that must've sucked). He is going to send me a new trigger and disconnector along with a prepaid USPS box to return the faulty parts. That's perfect. |
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Max,
I am glad that you got everything working properly. I am sure that this isn't the first time others have had this problem. All those parts are made in mass amounts and boxed up and shipped to who ever buys them and puts the kits toghter. I know for fact, that no one ever checks for tolerances on those parts. Back when I built my first 25 years ago the AR 15 Lower parts kits were M16 parts reworked, they just clipped the tail off of the disconnector and ground the tip off of the Hammers, I have heard that back in those days that there were some people that bought New Bushmasters and Colts that would have a M16 part or 2 in them. I am glad that every thing worked out okay. I allways pre fit my parts and have had to do a little filing here and there, no big deal. Don't take my post in a bad way, I was just stating the facts and in no way want to offend anyone. Have fun! ACE |
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Good they did right by you.
Parts fitment issues are a part of BIY. Many of the LPK parts are Hecho in Mexico to meandering tolerances. Some places receiving do a batch inspection, some places don't inspect at all. I would be surprised if any place gauged out every part of a LPK. You can buy individual parts that have been inspected –– I just ordered an extractor spring and insert and O-ring for $5. Clearly that would drive the cost of a LPK well over $200 very quickly if done for every part. Maybe there's a market for that, but it wouldn't be a big one. Most of the parts just aren't that critical. When the factory builds a rifle their people run into the same problems if they bother to check. That's why I think BIY is a great idea, you know that the parts work right and are in spec. |
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