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Posted: 11/17/2005 5:14:33 AM EDT
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Just built a new lower on a Dlask Arms milspec lower (Canadian maker). Used a DPMS lower parts kit. Went together like lego - no worries except for one. The rear takedown pin. When I first put it together and opened the pin the thing would not close again. I had to hammer it with a screwdriver handle to close it and it sheared the tip off the conical side of the detent (maybe 1mm of material). Before it sheared it locked closed just fine but when I opened it, it locked too tightly which prompted the screwdriver treatment and the shear. Hmm.... So I pulled it apart and flipped the detent around to the more rounded end. Now when the pin is open it locks OK in the open position, though perhaps not as stiffly as I'd like but when I close the pin it does not lock into the detent hole in the pin and will start sliding out to the open position with the slightest of fingertip pressure - in other words th detent is either not engaging the hole on the takedown pin or if it is, the detent is not pointy enough to positively engage it. Any ideas? I could try a new detent and/or rear pin but I don;t have any spares on hand and would have to order them... I'm thinking mayby chuck the detent up in a drill and reshape the sheared end of the detent pin back into a conical shape with a less severe angle than before and see if that fixes it. Ideas? |
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Order a new detent pin, But in the mean time, chuck the old detent pin up in a drill and spin sand/file the old detent point back into condition. Note: if the detent pin did shear/smear the tip, then chances are the pin was not correctly heat treated. Now this bring up the next point, when you get the new detent (read heat treated correctly), you can slightly dull the point to allow it to glide in/out of the take down detent hole by running the point over a piece of 400 sand paper. Don't go buck wild, you only want to slightly dull the point, and not totaly round it off. |
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OK, the replacements are in the mail. "Fixed" the old detent by reshaping the tip, but after cutting through the remaining heat treated outer layer of the pin which we've determined wasn't very "in spec" to begin with, I can see where it's already starting to wear after maybe 50 or so "in and outs" of the pin while I was testing it. Guess I just got a bad detent pin. |
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