I just installed KNS anti-walk pins on a LMT lower and after I tightened everything down there was side to side play of approx 1/16". Is this normal or did I buy the wrong ones? Thanks!
That happened to me with my Sun Devil lower. No problems as of yet. What trigger group do have? Because come to think about it, it didn’t do that to me until I installed a Timney drop in system.
aren’t there different sizes for the KNS pins?
Yes… .154,.155,.170 The last size is for Colt.
Did you tighten down the allen screws when you installed it?
Yes I did, the movement from side to side is ever so slight. The funny thing is it didn’t do that until I installed the Timney in. On my 6920 their perfect and on my Noveske GTG. It might be the Sun Devil is little out spec,but like said no worries it shoots great and trigger pull is awsome.
Stock/OEM pins work fine.
Why change? 
I am using the GenII pins on Stag lowers. There is a slight bit of lateral play. I’m sure the pins were designed to accomodate the tolerances allowed in lower width.
Not again?!:rolleyes: Why use 4150 steel on a barrel? Why worry about staking the carrier key? Why concern yourself with utilizing a MP tested bolt? The KNS pins are a reliability enhancement. Nothing more, nothing less. Although, I will admit their polished surface does improve trigger pull somewhat.
They are tight, I assume the different sizes have to do with the diameter of the pins not the width of the lowers.
I sincerely doubt the LMT lower is out of spec. The KNS pins have to be designed to account for tolerances on the width of the lowers, therefore the pins are slightly longer than most lowers are wide. The pins will prevent walking regardless of the very slight lateral play that may occur.
Your call; your cash…
There are millions of AR/M-16’s out there with stock pins that run fine.
I understand that we want our wepons to be reliable but I don’t think that fire control group pins are an issue. What happens, as in the post above, is someone replaces good parts with feel good parts and all of a sudden they think that their whole lower is out of spec. :eek:
And yes the items you listed should be right from the get-go; of course we know that is not always true for most weapons. I replaced the whole BCG on my BM with an LMT unit as I don’t trust unmakred “MPI” parts.
.
And that same amount run fine without 4150 steel barrels, properly staked carrier keys, and MPI’d bolts.
I understand that we want our wepons to be reliable but I don’t think that fire control group pins are an issue.
They were/are and that is why KNS developed the pins. Is it a frequent issue? No. But neither is 4140 barrel steel melting, so why the desire for 4150 steel?
What happens, as in the post above, is someone replaces good parts with feel good parts and all of a sudden they think that their whole lower is out of spec.
Then they need schooled. And the KNS pins are no more feel good than is an MPI’d bolt or 4150 barrel steel. They serve a function. Just because you don’t believe it’s necessary, doesn’t invalidate the function.
And yes the items you listed should be right from the get-go;
Why? The list of “specs” on “The Chart” are in no way required to get an AR to put lead downrange. They may be required to insure you have the most reliable weapon possible, but they certainly aren’t required just to get the weapon to function.
All good but the subject was pins.
There is no good reason to replace the stock pins. (unless they are broken or your putting in new fire control parts)
As for the other stuff sure. If your gun is out of spec do what you need to get it up there. As a BM owner I had to swap out some stock parts to ensure top quality and I felt justified in doing that just as you feel justified swapping your pins.
I think we can agree to dissagree. 
These are not valid comparisons in my opinion. Those 3 characteristics are requirements in the TDP. They are specifications intended to ensure function and quality in a military weapon. KNS pins are most certainly not.
Look at some of the other items KNS sells. Cross hair front sight posts? :rolleyes:
Seriously though can we try to not have this same discussion in every thread that references KNS pins?
I installed the GenII pins in both the 9mm and 5.56 SBR lowers I have.
Reason, the 9mm bounced out a trigger pin once and to help ensure the longevity of the lowers it’s a small price.
Both of mine have play at the hammer pin but not at the trigger pin. It appears they make the hammer pin a tad long for whatever reason. It’s not going anywhere though.
My non-SBR lower just has standard pins.
To the OP, I have GenII KNS pins in 2 Colt lowers and 2 Noveske lowers, there is a slight amount of play side to side on all 4.
And to all the annoying BS, I don’t care what you think, I don’t care what you use, I know why I use what I use. We don’t have to agree. Get over it.
Yup, I agree.
KNS pins are most certainly not.
I disagree. KNS pins are most certainly intended to ensure function and quality.
I’m not sure what KNS did to piss off so many folks, but I guess that’s just how it is. Reliability enhancements seem to only be worthwhile if they don’t come from KNS.
I have 2 lowers using them right now…soon to be 3. Right now my RRA and 6920 lower both have lateral play in them…slight amount that shouldn’t matter.
About the KNS Controversy; until someone can provide me with solid technical evidence on why they are a waste, I’ll continue to trust them in my guns.
“Their not part of the TDP” is an uneducated answer…Isn’t there a TDP for the M9 Service Pistol?..I don’t see anyone arguing about M9 parts.
the TDP goes out the door if you’re not using the stock trigger components, and with more aftermarket triggers becoming available, the extra ‘security’ that KNS pins can provide peace of mind.
drop-in modules like the timney and mcormick don’t rely on spring tension to retain them, and for me at least, i feel that KNS pins are better than using the stock pins with the timney or the c-clips supplied with the mcormick.
some other aftermarket trigger groups which utilize the stock pins have reduced power hammer springs, which might not retain the stock pin as well as the stock spring.