Or what are the actual differences between a lower parts kit that meets the TDP vs say a RRA lpk? dimensions, springs, pins, materials, heat treat, shot peening, etc.
The other question is, how can one tell the difference between a good LPK and a poor quality LPK.
I’m specifically not interested in the trigger group, as from now on I’ll stick with Geissele triggers.
What makes a LPK’s “Mil-Spec?” That’s simple. Having the TDP does. So that means FNH and Colt.
The TDP means that the company follows a set standard on everything from size, to hardness to the shade of the phosphating.
Unless you know exactly where the parts come from, it is hard to tell what the quality is.
For our LPK’s, we typically like to use LMT components for the major items.
C4
You pretty much need to buy a Colt LPK to know what you are getting…
The problem with all the other kits is that you wont be able to find out where they source their parts.
It’s not kool-aid, just a fact. I would use a G&R or a DD kit before used all the others. I wish LMT made a kit…
Generally I agree with everything ya’ll have said.
Take DD for instance I have no doubt in my mind whatsoever that they make great stuff. But they obviously do not make their own LPK. So I ask what specifically (besides their reputation) makes their LPK better than the next guys. The same question applies to anyone known to sell good lpks (outside of Colt or FN).
How do you know that DD doesn’t make theirs? Aside from reputation, assuming a company outsources this then it would be from whom they get the parts.
It’s either made by Colt…
Or this is a trick question.
Well, assuming a company does outsource, and beyond holders of the TDP, what companies are known for manufacturing quality LPK’s?
Though I am more concerned with the technical aspects of the materials and processes that go into a quality LPK.
We generally have this information about bolt carrier groups, however LPK’s seem to be an unknown as far as what constitutes a quality one.
For me personally, I rank LPK’s in this manner:
Best:
Colt
FNH
Good:
LMT
G&R
BCM
Noveske
KAC
DD
C4
Grant~
Under “Good” was their any particular reason for your order or just random in that section? Just curious? Not tryint to dig into something that may or may not be intended.
Thanks
shane
Random.
C4
That list still doesn’t get to the meat of the question. What qualities actually differentiate a good lpk from a more questionable lpk.
I am also going to restate that the fire control group is not included in this question.
And from what I can tell BCM doesn’t currently sell their own branded lpk. Atleast they don’t list one for sale.
Would spikes tactical enhanced LPK be considered quality parts and kit?
This is the 2nd thread on this topic in the past week or so.
I doubt there will be any conclusion to this subject.
…
This is the 2nd thread on this topic in the past week or so.
I feel like I’ve read this before… 
I would like to know that one also.
I base my opinion on personal experience with different LPK’s. I also watch the net for broken parts, rough selectors/FCG and just any issues in general.
BCM does not sell their LPK’s, just like LMT doesn’t.
C4
FWIW, all the DD’s I’ve felt, including mine (a LPK), had smooth as silk triggers. I even nixed my plans for a Geissele in this rifle due to the smoothness/crispness of the DD trigger.
What is the name of the steel, rock hardness, manner of manufacture, and required tolerance for Colt and Fn lpk?