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Thread: The LPK puzzle

  1. #1
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    The LPK puzzle

    While at work perusing through this site and others that prefer higher grade gear, I was thinking to myself how much fantastic information we now have at our fingertips that can explain why certain processes and materials are better than others in creating parts for a reliable, hard-use defensive carbine (Needed to make this distinction, as I'm not talking about plinkers, match rifles, varmint rigs, etc). For example, we know that we should be looking for Mil-Spec 11595E - 4150 Grade Barrel Steel (CMV) and for HPT/MPI when looking at barrel specs and that we should be checking the BCG for specs that mimic BCM BCG specs. I know there's tons more I can add, but you get the point.

    For the major components of the AR it seems that one can easily look up why certain parts from certain companies are considered superior to 'run of the mill' parts from lesser companies. However, I don't think I've ever seen specific information regarding what makes one LPK better than another. What are the specs for these parts?

    I apologize if this has been covered before, but the LPK, at least to me, is the most enigmatic piece of the AR puzzle, as I've never seen specific information as to what the golden standard is. Plus, people are very secretive as to who makes the parts that are considered good. Yes, I know COLT AND LMT are two, but it seems that there are other manufacturers that also make good parts, but it's not kosher to disclose who.

    ETA: I wanted to add that I have the most experience with CMT/STAG LPKs, which, by most accounts, appear to be, I guess, 'decent' quality. However, when I received my LPK from GRANT the parts appeared to look better.
    Last edited by urbankaos04; 06-24-09 at 01:01.

  2. #2
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    It is really hard for there to be a "golden standard" with the LPK since the stuff we put in is very different from the mil-spec stuff we have a safety switch, where the military stuff is safety/single fire/3 round bust. So the FCG is not going to have the Mil-spec standard along with the safety. The only other piece that I could think of that could be that would be a concern for me is the bolt hold open latch. As for as springs and the detents (sp?), well that one I think is mute point.

    Of course this is my warped logic and it could be wrong.


    (climbs back into the mountain to hide from the M203/Mk19 fire)

  3. #3
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    I did notice the bolt catch feeling a bit better constructed in Grant's LPK than the CMTs I'm used to dealing with. It hard to put into words, but it just seemed more solid, I guess.

  4. #4
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    What makes one LPK better from another could be anything from "finish" to quality of the material used. It could also be how the part "fits" in your lower.

    Since the holes and position of holes in a lower receiver can vary and LPK's can vary in sizes, it is really somewhat of a crap shoot on how things will fit.

    While you like our LPK, someone might have a Billet lower (that is way too tight) and our LPK's do not work for them.




    C4

  5. #5
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    Quote Originally Posted by C4IGrant View Post
    What makes one LPK better from another could be anything from "finish" to quality of the material used. It could also be how the part "fits" in your lower.

    Since the holes and position of holes in a lower receiver can vary and LPK's can vary in sizes, it is really somewhat of a crap shoot on how things will fit.

    While you like our LPK, someone might have a Billet lower (that is way too tight) and our LPK's do not work for them.


    C4
    Yes, this is true and was evident when I assembled two lowers not too long ago. One lower had a pretty damn good trigger pull for a stock trigger while the other one had a very gritty and craptastic feeling trigger pull, which is why I ended up going with a Geiselle SSA trigger.
    Last edited by urbankaos04; 06-25-09 at 16:55.

  6. #6
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    My favorite LPK comes from White Oak Armament, it does not have a trigger/hammer group which makes it an easier financial decision to drop in my favorite trigger, the Geiselle SSA.

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    How much are they?

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    Quote Originally Posted by urbankaos04 View Post
    How much are they?
    http://www.adcofirearms.com/itemdeta...orynumber=2103

  9. #9
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    Good price, too bad they're on back order. Sent John at WOA a message, though, to see if they have any in stock.

  10. #10
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    I also noticed that the buffer retaining pin in the STAG LPK was a little undersized in comparison to GRANT's LPK, so it has more back and forth movement.

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