User Panel
Are you gong to offer Gen extractors to those who already have an ACB bolt?
How much less does this carrier weigh than a standard M16 carrier? Are the ACB bolts offered in hard chrome as well? |
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I have to build them into the web store. I will post when it is done.
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Ok....so when are these and your lower receivers going to be available for purchase? Have you thought about a package price for a AIC, ACB and GP stripper lower
Thanks |
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I picked up a couple of the bolts in 6.8. They look awesome. Fit and finish is perfect. Though I only have a few shots down range with one it functioned perfectly.
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The tapered front on the carrier is interesting, but I'm having a hard time figuring out what is "advanced" about the rest of the carrier. Why not just make it like a regular M16 carrier?
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+1 |
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Because we already manufacture the carrier with the improvements for the piston gun. We have no reason to make standard M16 carriers. It would take more to modify them than to make from round stock.
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www.ar15.com/forums/topic.html?b=2&f=171&t=150207 |
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Sooo, any possibility that you will be making a mirror-image version of these things for the left-handed Stag crowd?
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OK, but that doesn't answer the question as to what makes it "advanced". |
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The same thing that makes the LMT enhanced. Only the use of the word enhanced seems to be in use.
There have been improvements made to the carrier that make it work better. Does not shoot laser beams or anything, but advancements have been made. Did I tell you about the gas filter we retrofit to the vents? We are working hard along side the phillip morris people on that one. |
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Will the 7,62x29 bolts break just like other brands, or is this so touch that it won't? I have broken two so far in under 500 rounds.
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The ring at the rear should, theoretically at least, smooth out cycling, which may not help reliability as much as controllability. |
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The 7.62x39 bolt was designed to handle the thrust from the .499LWR cartridge pushing out a 300 grain bullet at 22,00 fps.
Simon |
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DAMN NICE JOB!!!
I may have to try one of these on one of my C7+ guns!!! Thanks, also, for support the Direct Impingement folks like me. Personally, if I wanted a piston I'd grab my M14. Keep up the good work. |
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I really want to buy one of these bolts and BCs, but I'm patiently waiting on your matched receivers.
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So I know you guys have been testing the hell out of these bolts. How are these bolts eventually failing -- breakage due to super high round counts, finally failing headspacing, other? Are they lasting 20k rounds in direct impingement carbines (16" and shorter carbine length gas system) and at what rate (ex. 65% last 20k or more, etc.)? And since the extractor springs are rated for way more cycles you never have to replace them? What about the ejector spring, is that just a standard spring? What did you shoot for in the way of extractor spring tension? How does the extractor tension compare to others such as the gold M4 spring, SAW spring, or Wolff spring? Being made of hardened mining steel, do they wear out the inside of a chrome carrier? Very excited about your product, would like to hear more. Thank you for your help.
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Some damn good questions from wyv3rn. I'm also highly interested in the answers to his questions..in the market for a bolt carrier group and want to know a bit more about the LW product before I pull the trigger.
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I like it, however.
Will you be offering them that are SP1 spec/Lightning Link compatable? |
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Will the radiused web betwwen the lugs work in a regular extension?
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We have not had one fail yet. ARDEC has some and so does Colt for their LAR. Neither have reported failures. 80000 rounds on the one we are testing and still going. On examination, it shows no signs of fatigue. Of course we have more chalking up round counts in demo guns. Lifetime bolt. Lifetime Guarantee.
When these were demonstrated to the USMC their comment was if the extractor springs are rated for the lifetime of the weapon we had to either make them unaccessable to the troops or make them captured springs. We made them captured springs. In piston carbines the ejector spring has held up beyond what LW expected, this because the springs do not get hot as they do in impingement carbines under sustained full auto fire. We have not had any problems with the extractor springs in the impingement guns. The ejector spring is a standard spring on the ACB. There were was nothing compelling LW to change it as they did not have issues with it in piston guns which is the focus. The ejector spring would need to be replaced on the same schedule as a standard bolts ejector spring as these are standard items.
I will get numbers for you. I don't have them. No comparison has been made to the other products that I know of. LW titrated the tension to where it was found to be functionally ideal in both tension, and buffering. With 2 springs alone, the extractor can bounce or skip over the rim regardless of tension. Therefore you have to buffer the springs so they are like shock absorbers as opposed to simple springs. The extractor spring and buffers seem like a small deal, but this took far longer to perfect than all other issues.
This is not bit steel but gear steel. If you shoot for a steel that is uber hard, you end up with a brittle bolt. This steel has a hard surface and a tough core. They do not wear the barrel extension. Only the gas rings are in contact with the carrier and these are standard rings. Of course all of the carriers are chrome lined.
Yes. Note that they have a very tight radius.
I don't think so.
Auto carriers are likely and those that shoot auto will gain the most benefit. This is sort of an experiment to see if people even want an improved carrier. I will encourage LW to support impingement but the short stroke piston is their priority and manufacturing time for the piston components will always get priority. They are what they are. Very nice top end AR parts. |
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Why don't you only make auto carriers? They are legal in a semi. Then you can have one part for everyone.
I am glad you are doing this. If you can make lifetime extractor springs, that would be amazing. I am not sure how you can do that -- and I have the feeling that a few Beta-mag dumps in an impingement system will cook your springs. I also bet if you sent me a 7.62x39 one it would break in my rifle within 200 rounds. I broke two bolts already and I have less than 500 rounds in the gun. |
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Oh, on the 80K gun the headspace did grow, but it was marginal as measured by the incrimental HS guages from day 1 XXX round. I don't know where it ended up but never closed on field. Since that gun did its duty almost completely in full auto, the barrel throat was completely eroded and allthough it did still shoot safely, in the end it didn't shoot as straight. The barrel was replaced. The bolt was put in the gun with the new barrel and it headspaced fine. So I am not sure when headspace would have completely dumped. This particular gun was a piston gun, and piston guns unlock unopposed which also reduces bolt stress.
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Robert, the whole start of the ACB was to design a bolt that could deal with the bolt thrust of the .499 which is significantly higher than 7.62 by 39.
I would like to send you one to use in your 7.62 by 39 to see if it breaks. |
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quote:
"Lifetime bolt. Lifetime Guarantee" So if this bolt fails for ANY reason, in it's lifetime, it will be replaced no questions asked?? what are the terms of the lifetime guarentee?? |
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48thHighlander, I appreciate your forthcoming answers. I have a few follow ups if you don't mind.
This applies in direct impingement guns as well?
Is it possible to obtain replacement springs & buffers if necessary? Will their life be shortened significantly in a direct impingement gun or are they made to stand up to high heat (chrome silicon or some other material)? Are they user replaceable? Can we see some pics of the new design?
Exactly what I wanted to know, thank you.
I appreciate you looking into this for me. Extractor spring tension was the downfall of the LMT Enhanced bolt IMO. Far too low, far to easy to cause it to fail to extract.
I thought that raised ring around the bolt also contacted the inside of the carrier. Either way, good to know they are not wearing out chrome lined carriers. Have you tried McFarland one-piece gas rings with this bolt? If so, do you believe they last longer, or are more durable than the standard 3pc gas rings? There is no problem with the 3pc of course but products can always be improved! |
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48th,
I noticed you mentioned that ACB were prof load tested. Will the also be MP inspected and marked as so? |
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This is true. I have an LMT enhanced in my LMT 10.5 and it failed to extract once this week. My previous Colt bolt with a Wolff never did that. |
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48thHighlander,
Is the gas key attachment different? I would like a key where the load bearing points are not the screws holding it to the carrier. The only part I have broken was the key screw. It was not obvious and it took a long time to figure out why my rifle was short stroking. I have thought of welding the key inplace. |
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I want to know also. Please. |
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On the piston guns the key is dovetailed and fits into a dovetail in the carrier. On impingement guns they are standard keys except they are staked properly. The key on an impingement gun is not subject to the same shearing forces as are present on a piston gun. An impingement key is very soft compared to the ones we make for the piston guns. Impingement keys are subject only to stress of cocking and to the violent movement of the carrier. Thus if the key was not staked properly the screws could walk out causing problems. Of all the recent factory guns we have messed with, not many have had a manly carrier key screw staking job. I find it wierd because its not like it takes any longer to do it properly.
The dovetail on the piston carrier is Wire EDM cut to ensure a tight repeatable fit. It is very expensive to do, and would be mass overkill on an impingement carrier. If someone desired a welded key, it would be very easy for us to do.
Samples were proof tested to look at a worst case scenario. Each individual one is not. This is a different material with a high nickle content. In other words magnetic particle testing would not yeild accurate results as the steel magnetizes more like stainless than carbon steel. LWRC does have an MP machine though it is a moot point with the material. This steel and its design may render that step obsolete if adopted in any type of military contract.
We have had no need for the McFarland rings. The gas rings on the piston gun stabalize the bolt and that is it. In my years as a weapons tech in the CF, I never had an issue with standard rings. That is not to say the McFarland rings are not better, just that there have been no issues with standard rings. We can look into the McFarland as an option. |
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On all LW products, the lifetime guarantee applies. Impingement or piston. Even the springs.
Paul is in a log cabin this weekend, but when he gets back I will ask him to post the legal stuff. They way it works is, you send it back and it is replaced. |
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Am I correct in reading your post on the first page where you say you are only making this one run of direct gas impingement carriers, then will be shifting to piston carriers? So these will no longer be supported in the future?
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You want to be able to replace the carrier. Trust me. Pics will be online in a few days.
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Please explain. |
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Impingement carriers will be supported but LW will not be making them monthly unless demand dictates. When speaking with the CEO and PLW, they support impingement but did not want it effect deliveries of piston weapons.
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thats really sexy..I want one in chrome ha ha
However whats the address for the store so I can mark it for later? |
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What is going to be the minimum barrel length you can use the enhanced bolt with when used in an M16? I believe that it has been said before that the guns with short barrels, such as the 10.5 inch barreled upper mentioned earlier in this thread, have problems with extraction. I believe that the LW bolts before could not be used in weapons with a barrel shorter than 14.5 inches. Let me know what length of barrels we could use these new bolts with.
Charles Tatum Alamo Professional Arms |
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