LMT upper issue

The picture is not very clear, but it looks like the older generation of LMT. I cannot really see the barrel profile.

Problem with the gas block - you kinda want to have the original FSB because the barrel and the FSB were drilled together. So your extra FSB may or maynot work, especially if it is not drilled by LMT. ( straight pin vs taper pin)

I don't understand the JP gas block- that's the stupidest thing you can do to screw up your own upper.
 
Besides the original owner "telling you" that it was an LMT upper what makes you believe that it actually is or was?

There is nothing in the pictures to indicate that it is in fact an LMT upper receiver... no LMT logo, no markings, etc..

You didn't show any pictures of the barrel stamping so no way to tell if that's from LMT or not.

Every other component (the quad rail, gas block, etc.) has been changed and is not LMT.

In all honestly it's erroneous to call this an LMT Upper... maybe it was at one point in its' life but what you have there now is not anything to do with LMT.

It's a Franken-upper :)

If it don't work blame the guy(s) who built it... and that wasn't LMT... this is not (as the THREAD title states) an "LMT Upper Issue" ;)

Mark
 
WTF? Why do people insist on putting tape on the case deflector? It's a rifle for crying out loud, not an antique vase from the Ming dynasty.

Hopefully the FSB you have is original to the rifle or you're going to have problems with it.

Looking at these pics make me wish I bought it, even if it's not LMT, and I'm not saying that it's not, it's a steal with all the accessories that came with it.
 
Mark I named the thread as I did because I was told it was an LMT and since everything else appeared to work before putting the rifle together, I believed that the upper was the source of the problem.

Hence the title, in the hopes that someone with particular knowledge of LMT uppers would contribute what they knew. It's not a dig at LMT uppers, and as you have pointed out a couple of times the upper itself did not contribute to the original issue, a problem which has since been solved.

A little more work next week and hopefully I will sort out the remaining problem with this upper whatever its manufacture. :)

Oh, and Leg, the EOTech was not part of the deal, I added it on in order to check out the upper at the range. ;)
 
I know that it wasn't part of the deal, but an 10.5" upper, whether it's LMT or not, with a Larue rail, KAC BUIS, Insight M3 light is a steal at what you paid for it.

Mark, this upper was advertised as an LMT in the EE. I personally passed on it because it didn't sound like the real deal so I didn't want to take a chance the rest of the stuff was airsoft. Not everyone knows enough about this stuff to be able to identify what's what so if he was told it was LMT he'd have no reason to doubt it. Are you just worried because LMT is still in the title?
 
Leg said:
I know that it wasn't part of the deal, but an 10.5" upper, whether it's LMT or not, with a Larue rail, KAC BUIS, Insight M3 light is a steal at what you paid for it.

Mark, this upper was advertised as an LMT in the EE. I personally passed on it because it didn't sound like the real deal so I didn't want to take a chance the rest of the stuff was airsoft. Not everyone knows enough about this stuff to be able to identify what's what so if he was told it was LMT he'd have no reason to doubt it. Are you just worried because LMT is still in the title?
Click to expand...

Not worried and not blaming the original POSTer... I just wanted to clarify for the 100's of people who view these THREADS and who may be less knowledgeable... Thread Titles are often what sticks in a reader's mind.

FORUMS are very powerful... they have the ability to spread information, inform, educate, etc... but it's a two edged sword. While they are great tools for learning useful and accurate information, they can also be destructive tools for spreading misinformation and errors. This is often overlooked, especially by a lot of the "newbies" on the forum.

Some readers will read the title, then read the first couple of posts and then stop there... later telling their friends they read a post about a guy who had issues with his LMT Upper not working properly. I've seen that more times than I can count. It's unfortunate but it happens.

Mark
 
Leg said:
Not everyone knows enough about this stuff to be able to identify what's what so if he was told it was LMT he'd have no reason to doubt it.
Click to expand...

Want free candy?

free_candy_van.jpg
 
mebiuspower said:
Want free candy?

free_candy_van.jpg
Click to expand...

I'm not sure where you're going with this, but yes I do take chances at times when I buy stuff on the EE. Overall, I think my buying instincts are reasonably good, although I'll freely admit to the occasional mistake.

BTW, it seems to me I bought a rail system from you at one time and took you at your word.

The alternative can be looking a gift horse in the mouth .... my money, my call.
 
I believe the upper is the older generation of LMT ( before they laser engraved their uppers) - even though the pictures are not clear.

The seller probably cannot make it to work after he put the retarded JP gas block on it - it maynot be aligned probably or the block does not seal correctly.
 
Just to be clear

Questar said:
Not worried and not blaming the original POSTer... I just wanted to clarify for the 100's of people who view these THREADS and who may be less knowledgeable... Thread Titles are often what sticks in a reader's mind.

FORUMS are very powerful... they have the ability to spread information, inform, educate, etc... but it's a two edged sword. While they are great tools for learning useful and accurate information, they can also be destructive tools for spreading misinformation and errors. This is often overlooked, especially by a lot of the "newbies" on the forum.

Some readers will read the title, then read the first couple of posts and then stop there... later telling their friends they read a post about a guy who had issues with his LMT Upper not working properly. I've seen that more times than I can count. It's unfortunate but it happens.

Mark
Click to expand...

Mark I've had the pleasure of dealing with you on more than one occasion and have found you to be first class both in terms of integrity and service. As such I do appreciate your sensitivity about goods that you import and sell and thus may be associated with your (very good) name and reputation. :)

If there is anything you feel I am doing which somehow damages your reputation or reflects unfairly on the products you carry, just send me a pm and we can discuss a solution. :)
 
greentips said:
I believe the upper is the older generation of LMT ( before they laser engraved their uppers) - even though the pictures are not clear.

The seller probably cannot make it to work after he put the retarded JP gas block on it - it maynot be aligned probably or the block does not seal correctly.
Click to expand...

GT I suspect you are right.

Can you give me some guidance on better pics?

Yes, I'll try to get clearer images, but are there any particular areas you'd like to see. I know you'd like to see the barrel profile (so would I) but that will have to wait until next week.
 
... retarded JP gas block, indeed!

Well, this story has a happy ending. :)

As some of you predicted, changing the gas block back to the original FSB type would restore my upper back to reliable functioning as well as a more tasteful appearance. I took the upper to my gunsmith who removed the f/h and gasblock and showed me the problem ... gas erosion inside the block! The resulting leakage caused the short stroking as would be verified by a later function test.

I took the upper home and searched diligently for markings but found none, except for some on the FSB ...

LMTorNot3.jpg


That says E 01 and there appears to be an 'FN' inside the circle next to those letters followed by another number 1. I could see nothing on the barrel itself, peering in as best I could without removing the freefloat rail system.

I did take a pic of the area near the ejection port as I noticed the upper was constructed slightly differently than others I'd seen. Here's the pic:

LMTornot1.jpg


The area just to the right of the port is not milled out ... I'm not sure what this might signify in terms of who made it, though.

Anyways, after I got the upper home I decided to see if the FSB would go on or not. As it went on smoothly I concluded that it might well be the original part for the upper and felt it was worth completing the assembly and testing it out. I am happy to report that the upper functions reliably and shoots very accurately. It is also a very pleasant and smooth upper to fire ....

So, in conclusion:

1. the after market gas block was indeed the culprit
2. the upper now functions reliably (yay! :D )
3. I still am uncertain as to the manufacturer
4. Clues include M4 feed ramps, FSB markings as above and a little different construction near the ejection port.
 
I'm glad that everything worked out well in the end. I prefer the look of the A2 front sight base as well. Overall, even with the hiccups, I'd say that you got yourself a decent upper at a good price.
 
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