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Thread: very best LPK

  1. #1
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    very best LPK

    building a new AR and useing a billet lower and want the best LPK. are the RRA LPK's any good ? no 2 stage or adjustables and prefer to have standard springs
    WHO ME ? ---- A government big enough to
    give you everything you want, is
    strong enough to take everything
    you have.
    -- Thomas Jefferson

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    LMT LPK from Grant fills that need.

    See options here.

    http://www.m4carbine.net/showthread.php?t=852

  3. #3
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    what makes the LMT better than the $60.00 RRA LPK ?
    WHO ME ? ---- A government big enough to
    give you everything you want, is
    strong enough to take everything
    you have.
    -- Thomas Jefferson

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    I don't know how much better the lmt is vs the rra, I do know that a rock river arms lower doesn't have a mil spec buffer and their best kits involve the 2 stage nm trigger and a lot of folks aren't very fond of that. They also don't do a few of the things with their uppers that LMT will do with theirs. I see it as a fool me once, fool me twice type thing. I just think reputation alone and peace of mind can be worth a few dooolars on setup.

    I would basically go with a LMT basic kit for around 70 bones or the one with the magpul trigger gaurd for a bit more. Than i would slap a timney trigger in there.

    I have a rra lower that I got with a rifle and sold the upper to. It's always worked just fine. I also just bought a sun devil billet lower and I am in the process of putting it together with LMT and timney trigger parts. I also bought a wilson combat bolt catch.

    I'm not sure that any kit is going to be the very best for every single part in it vs. another kit. I do know that LMT is a top mfg and is usually right on time with their products. I love my LMT upper and I'm satisfied that the company is doing the right things to produce good products.

    Besides if you use the lmt parts kit you can put that in your posts and even the kewl kids will oooo and ahhh.

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    Quote Originally Posted by GONIF View Post
    what makes the LMT better than the $60.00 RRA LPK ?
    I've asked that question before and I was told the difference is quality. The LMT parts are apparently manufactured to a specification that is outlined in the TDP. I, however, have not seen anyone produce empirical data which indicates that the RRA parts have a higher failure rate than the LMT parts. Since the price difference is over double, one has to wonder what level of performance they will be getting above that of the RRA. Unfortunately, there seems to be no data to indicate what that level may be.

    With bolts, the price difference between a HP/MP bolt and one that is not is less than 10%. The price difference in LPK's is over 200%. Personally, I'm more than comfortable (even in a protracted firefight) with my RRA LPK. The cost/quality ratio just doesn't support going with the LMT. Unless, of course, someone has the empirical data to support a different cost/quality ratio (i.e. the RRA parts fail twice as often as the LMT parts).
    Just one of the Shepherd's sheepdogs. Joshua 24:15

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    Quote Originally Posted by exitinyourhead View Post
    I don't know how much better the lmt is vs the rra, I do know that a rock river arms lower doesn't have a mil spec buffer and their best kits involve the 2 stage nm trigger and a lot of folks aren't very fond of that. They also don't do a few of the things with their uppers that LMT will do with theirs. I see it as a fool me once, fool me twice type thing. I just think reputation alone and peace of mind can be worth a few dooolars on setup.

    I would basically go with a LMT basic kit for around 70 bones or the one with the magpul trigger gaurd for a bit more. Than i would slap a timney trigger in there.

    I have a rra lower that I got with a rifle and sold the upper to. It's always worked just fine. I also just bought a sun devil billet lower and I am in the process of putting it together with LMT and timney trigger parts. I also bought a wilson combat bolt catch.

    I'm not sure that any kit is going to be the very best for every single part in it vs. another kit. I do know that LMT is a top mfg and is usually right on time with their products. I love my LMT upper and I'm satisfied that the company is doing the right things to produce good products.

    Besides if you use the lmt parts kit you can put that in your posts and even the kewl kids will oooo and ahhh.
    Is is me or did we just get diverted to TOS?
    Just one of the Shepherd's sheepdogs. Joshua 24:15

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    Quote Originally Posted by rmecapn View Post
    I've asked that question before and I was told the difference is quality. The LMT parts are apparently manufactured to a specification that is outlined in the TDP. I, however, have not seen anyone produce empirical data which indicates that the RRA parts have a higher failure rate than the LMT parts. Since the price difference is over double, one has to wonder what level of performance they will be getting above that of the RRA. Unfortunately, there seems to be no data to indicate what that level may be.

    With bolts, the price difference between a HP/MP bolt and one that is not is less than 10%. The price difference in LPK's is over 200%. Personally, I'm more than comfortable (even in a protracted firefight) with my RRA LPK. The cost/quality ratio just doesn't support going with the LMT. Unless, of course, someone has the empirical data to support a different cost/quality ratio (i.e. the RRA parts fail twice as often as the LMT parts).
    For me QC is the big issue with LPK. I have not used a LMT LPK but have been using COLT LP's for a few years now. The CMT/Stag LPKs I've used have almost all had a part that was out of spec. IE on one the Pivot and take down pins were useless, as in super monkey jizz lube and a sledge wouldn't have made them go in. I won't go into all the details of the problems I've had with various LPK's over the years but I just got sick of dealing with it. Colt Lps have been 100% perfect so far.

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    Quote Originally Posted by Warrior View Post
    For me QC is the big issue with LPK. I have not used a LMT LPK but have been using COLT LP's for a few years now. The CMT/Stag LPKs I've used have almost all had a part that was out of spec. IE on one the Pivot and take down pins were useless, as in super monkey jizz lube and a sledge wouldn't have made them go in. I won't go into all the details of the problems I've had with various LPK's over the years but I just got sick of dealing with it. Colt Lps have been 100% perfect so far.
    Thanks for the observations. Would you mind indicating how many builds we are referring to and the number of CMT/Stag LPK's you've tried vs. the Colt's? I'm am seriously trying to put together some statistics based on experience so we have some kind of empirical evidence.

    My experience is very limited. I've used three Stag lowers and put RRA LPK's in them and had no issue with fit or function on the LPK's.

    It'd be nice if someone like Pat Rogers chimed in with their documented experience on LPK failures by make.

    Karl
    Just one of the Shepherd's sheepdogs. Joshua 24:15

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    Yes It would be nice if Pat would weigh in on this. that's EXACTLY the imput that would settle this . so if your out there Pat please give me the benifit of your knolage on this . I would like to do it right the first time .
    WHO ME ? ---- A government big enough to
    give you everything you want, is
    strong enough to take everything
    you have.
    -- Thomas Jefferson

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    I've been trying to find out what happened to Pat, and why he no longer frequents this forum anymore?

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    Quote Originally Posted by GONIF View Post
    building a new AR and useing a billet lower and want the best LPK. are the RRA LPK's any good ? no 2 stage or adjustables and prefer to have standard springs
    No on the RRA LPK.

    The best would be Colt and LMT IMHO.

  12. #12
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    Quote Originally Posted by GONIF View Post
    what makes the LMT better than the $60.00 RRA LPK ?

    The quality of the parts is about the best way and easiest way to explain it. If you are willing to go with RRA, then make sure to look at Stag as most of the RRA parts come from them.


    C4

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    so the Colt LPK is the best ? I thought all Colt AR lowere were large pin units,do they make a standard small pin LPK ? I'd pay $85.00 for a Colt standard small pin LPK if I knew where to get it .
    WHO ME ? ---- A government big enough to
    give you everything you want, is
    strong enough to take everything
    you have.
    -- Thomas Jefferson

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    Quote Originally Posted by GONIF View Post
    so the Colt LPK is the best ? I thought all Colt AR lowere were large pin units,do they make a standard small pin LPK ? I'd pay $85.00 for a Colt standard small pin LPK if I knew where to get it .
    IMHO, yes simply because that they have .Mil standard to follow. They parts are checked and required to meet a standard. The majority of the other companies that produce these parts do not have to do that.

    So your second best option is to look at LMT.


    C4

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    Grant do you sell the LMT LPK? I didn't see it on your website. I thought they only come with their lower assembly. Please correct me if i'm wrong.

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    Quote Originally Posted by GONIF View Post
    so the Colt LPK is the best ? I thought all Colt AR lowere were large pin units,do they make a standard small pin LPK ? I'd pay $85.00 for a Colt standard small pin LPK if I knew where to get it .
    I think you're about $90 short.
    Aubrey<><

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    Quote Originally Posted by Rich776 View Post
    Grant do you sell the LMT LPK? I didn't see it on your website. I thought they only come with their lower assembly. Please correct me if i'm wrong.

    http://www.m4carbine.net/showthread.php?t=852


    C4

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    great that's what I needed to know . so the Stag LPK at $65.00 is out of spec ? I was under the impression Stag/CMT made the LPK for Colt, at least that's what a vendor has told me. I will spend more to get the Colt or LMT if they are indeed better . what I was going to do is lightly polish up the contact points lube it and install it . how deep is the heat treating to harden the parts,I don't want to F them up .
    WHO ME ? ---- A government big enough to
    give you everything you want, is
    strong enough to take everything
    you have.
    -- Thomas Jefferson

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    Quote Originally Posted by rmecapn View Post
    Thanks for the observations. Would you mind indicating how many builds we are referring to and the number of CMT/Stag LPK's you've tried vs. the Colt's? I'm am seriously trying to put together some statistics based on experience so we have some kind of empirical evidence.

    My experience is very limited. I've used three Stag lowers and put RRA LPK's in them and had no issue with fit or function on the LPK's.

    It'd be nice if someone like Pat Rogers chimed in with their documented experience on LPK failures by make.

    Karl
    Number of builds, about 30 give or take. I have tried a total of 3DPMS I got when back when I figured an LPK is an LPK. It was junk so I took it back and they replaced it, then this one was even worse so again I went back and got yet another that was not as bad as the first two and i made it work with some effort and spares I had.

    I did 1 build on an RRA kit for my brother who really wanted the RRA kit because he "heard" they made the "bestest" 2 stage trigger. That one went together fine although the trigger took a dump after about a year.

    CMT kits I've done maybe 10 or so builds with. They were fine at first but then I started getting some that were about as bad as the DPMS LPKs. So I stopped trying to save money and bought COLT lower parts. I'd rather pay extra for the quality and QC then keep going through the headaches with the others.YMMV. FWIW I have not yet tried the LMT LPKs and would certainly like to.

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    Bingo! so demand has driven down quality on the CMT LPK's while they try to maintain the lower price...It's the same thing with their lowers and tight mag wells etc. That has been my experience. What about Bushy?

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