I've had problems with the enhanced bolt, but not the enhanced carrier.
Would be interesting to see what happens if he slipped the DD bolt into the enhanced carrier? I bet it would run.
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I've had problems with the enhanced bolt, but not the enhanced carrier.
Would be interesting to see what happens if he slipped the DD bolt into the enhanced carrier? I bet it would run.
LMT is very clear that the enhanced carrier is designed for carbine gassed 14.5" and 16" barrels.
The middy system sets out to do the same thing as the lmt enhanced carrier, but in a different way. They are not meant to be used together and it is too much of a good thing.
You still can use the LMT enhanced bolt and its benefits, just put it the factory DD carrier.
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I've spoken with Gene and another guy in tech support at LMT many times about their enhanced carriers.
The latest version of the enhanced carrier works with 5.56 barrel/ gas length combos that'll work with a normal carrier. They don't need more gas run, but will dump excess gas. The delayed cam tracking lets the chamber pressure drop before extraction. Makes extraction easier and lengthens bolt lug life. I've tried the enhanced carrier in very short barrels, and barrels with extended gas systems with success.
The enhanced bolt on the other hand is another story...
I have had no issues with the more current iteration of the LMT BCG from Scottsdale Gun Club in my 16" mid length Noveske.
I suspect yours has a bad extractor. I have seen this before on the Enhanced BCG's. Call LMT.
Last edited by Heavy Metal; 10-22-13 at 20:11.
My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.
Not to be over simplifying my troubleshooting approach, but you first mention you never cleaned the BCG. Only that you added extra juice. I'm going out on a limb here, but could not that be a problem? I recently built a DD rifle from parts. It wouldn't run for anything after the first 10-20 rounds. I fired from 20-50 and every round was not extracting. A quick field strip wipe down, and liberal application of liquid frog lube, viola. It ran the remainder of 500 rounds that day with zero problems.
It's just my technical approach to things, but before jumping in to things with the approach of a MIT Mechanical Engineering Grad, just think simple. Yes it's an "enhanced" BCG, but I can't imagine it not working.
And before one asks, in my described experience above, I had done basically the same thing the OP did. Only I added frog lube to an unclean, freshly assembled gun, so basically the same circumstance minus the LMT BCG part. Just keep the troubleshooting bit simple, people drive themselves nuts here trying to get into things like a dang super engineer sometimes.
Like on the movie Sling Blade when the retard proclaims "it ain't got no gas"!
I have 4 BCM midlengths (2x 14.5", 2x 16") and run LMT full auto enhanced BCGs (bolt and carrier) in all of them. I do this because I also run all of my guns suppressed roughly 60% of the time, and the enhanced carrier helps eliminate the effects of the excess pressure caused by the suppressor. I also run the enhanced bolt because it's much, much stronger than the standard bolt, which helps to prolong the bolt's life and resist breakage/wear/tear from all the extra oomph the suppressor adds.
I really doubt you're undergassing your gun with this combination, as all of my guns have functioned 100% through at least 1000 rounds each. They all run and lock back with H2 buffers/blue Sprinco springs and I haven't had a single malfunction in any of them. To add to it, none of them were cleaned in their first 1000 rounds other than adding oil to the BCG and bore after a range trip to prevent everything from locking up and/or corroding. My experience would tell me that, so long as you've properly tuned your gun with action springs and buffers, you're not undergassing your gun. Even if you were, I highly doubt an undergassed gun would be causing failures to extract. I imagine there's a problem with the bolt or the chamber, but most likely the bolt.
In order to isolate the problem, I would do the following:
- Clean the LMT enhanced BCG and retry. I can't imagine this would do anything, but it's an easy experiment to conduct and will help eliminate possible variables.
- If that doesn't fix things, try firing the gun with the DD BCG. The chamber could be undersized, and if you continue to have FTE with the DD BCG, the chamber would be my suspicion.
- If the DD BCG works fine, I would install the DD bolt into the LMT enhanced carrier and test for function yet again. If everything works fine, the culprit is most likely the LMT bolt.
- If things don't work with the DD bolt and LMT enhanced carrier, that means the problem is on LMT's end -- either the bolt, the bolt carrier, or both.
- If you really want, you could even try the LMT enhanced bolt in the DD carrier, but the bolt is designed to function with a longer extraction time, so this may not be a scientific test and may lead to further problems that are no fault of any of the components. If this combination would work, however, that would tell me something is wrong with the bolt carrier and not the bolt. If this combination wouldn't work, I wouldn't make anything of it.
Again, I'd suspect the bolt or the chamber, but more likely the bolt. Maybe IG or Robb Jensen could chime in since they've been at this way longer than I have, but that would be my plan of attack.
Last edited by DreadPirateMoyer; 10-22-13 at 23:54.
It's the extractor.
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