The cut down lug on the opposite side of the extractor is to even the load across the 6 other lugs and reduce the likelihood of failure in the 2 adjacent to the extractor.
I use the LMT E-BCG on my suppressed (SiCo Specwar 556) 11.5" Sionics SBR with Vltor A5H2, Tubbs AR10 flat wire spring, and SLR Rifleworks Ti AGB. HUGE improvement....zero gas to face. None. I also use the LMT Enhanced Carrier on my KAC 16" SR15 Mod2, unsuppressed, with Vltor A5H1 and Geissele Super42 Rifle Spring. Superbly well-running gun.
I haven't tried any of these, although i love the concept behind the LMT enhanced BCG. I use Bootleg adjustable BCG's. A different approach, but still effective. Great video. 💯
As far as I know the LMT Enhanced and Surefire weren't made for suppressors. They were made specifically for the 14.5 to reduce overall wearing. Back in early 2000s the military was finding the shorter 14.5 barrels were causing the bolt to wear excessively. LMT came up with this idea but Colt came back with a thicker socom profile barrel and putting a HD spring and o-ring on the extractor. The same issues came up back when they made the xm177 program and at the time Jim Sullivan wanted to re-design the system but never could. He noticed excessive gas and pressure build up that was way more than the 20 inch one he came up with. The surefire obc was what Jim Sullivan came up with had he been able to re-do the system. Overall I think the OBC is the better of the 2. I found it worked quite well and it is unfortunate that surefire isn't making any more of them, or as far as I can tell.
ya none of them were i believe designed with suppressors in mind. instead solving short barrel machine gun issues but it was interesting to apply it to suppressors. i never did a follow up on this but the delay in opening ends up decreasing the bolt velocity and the bolt ends up staying open a bit longer and "can" increase loudness at the shooter from what i observed
The LMT enhanced bcg cam path is longer in the straight part to allow more residual gas pressure to decrease before un-locking..The down side is these enhanced carriers will not run as reliable in the rifle system gas tube which is why the military rejected them..For short gas systems like the carbine length gas tube they work as designed..Jim Sullivan discussed this in his interview for Small Arms Review..He incorporated a longer/straight cut in the cam path for the Stoner 63 for this exact same reason....
I run LMT stuff. Every and any issue is basically solved with use of either partial or full flo thru cans. I use an rc3, and a knights qdc, and never needed to change buffers or spring weights.
The Lantac does have larger vent holes angled forward for the same reason the LMT has 3 vent holes. As far as gas venting it does the same as the LMT it just doesn’t have the altered cam path or enhancements to the bolt.
You do not get more chamber pressure from going with a shorter barrel, you put more gas up the journal, back the tube and into the gas key. You only make more chamber pressure if you run a hotter loaded cartridge
Icon Defense (a new company founded by “Mega” Mike Miller of Mega Arms fame, and Rick Olsen of Killer Innovations) has a brand new BCG with a modified cam path as well as an integral gas key. KAK actually just released a new “enhanced” BCG with sand cutters on it and the vent holes on the carrier are actually directed downwards rather than straight out. Apparently this makes shooting suppressed significantly quieter, and I imagine dirties up your mags quite a bit.
I think LMT finally released the material for the bolt, I recall reading somewhere that its Aeromet. The bolt lug they removed is supposed to load balance the rest of the lugs. Its generally understood that the lugs that fail most often are the ones neighboring the extractor. By removing that one lug opposite those two, it supposedly reduces the stress on them exponentially. For me, due to the proprietary nature of their bolt, I opted to just buy the carrier only, and install a Colt bolt. Extractors are wear items as are the springs, and not being able to easily replace those is more concerning to me, as I will likely need to replace an extractor sooner than the entire bolt itself. And if one is worried about the extractor spring itself failing, you can use an upgraded Sprinco that has a much longer cycle life. NOTE:: chrome Sprinco silicon springs need lubrication as they are not as corrosion resistant as stainless, without lubrication they can fail prematurely in wet/salty environments, just lube your gun like you should be doing anyway and it will be fine. Also Leitner Wise has now released their carrier I think. (Paul Leitner Weise is the LW of LWRC as I understand it, no longer affiliated.)
Never stopped on the patreon just haven’t been pushing anything new to the UA-cam side. Now im trying to start letting out a freebie once a week if i can. Hope to do more then that as well
I want to see a follow-up video showing the gassiness of a suppressed sbr ar15, such as a mk18, with the LMT vs. a traditional bcg. I want to know if the LMT will eliminate the gas issue with my suppressed mk18. An h3 heavier buffer, tuned down adjustable gas block, and gas buster charging handle helped SOME, but not enough.
the lantac doesn't have a roller cam pin it's just rounded off .they say it's easier on the upper receiver just throwing that out there.good video by the way
Me and another guy tested out the surefire BCG and we ran it on a meticulously built 11.5 with a standard old direct thread Gemtech LE556 and that thing couldn't cycle didn't matter what ammo or buffer weight we put on it nothing! It had a standard Colt 11.5 barrel with colts own pinned cut down front sight post and a cult of a receiver and even with the full auto lower we used which was a cult as well it still wouldn't work correctly. We used both my own semi-automatic lowers which were several even with the PDW buffer system and stock, a standard carving stock and buffer, and the A5 system, and the M16A1 buffer system and none of them worked. It was upsetting
The cut down lug on the opposite side of the extractor is to even the load across the 6 other lugs and reduce the likelihood of failure in the 2 adjacent to the extractor.
I use the LMT E-BCG on my suppressed (SiCo Specwar 556) 11.5" Sionics SBR with Vltor A5H2, Tubbs AR10 flat wire spring, and SLR Rifleworks Ti AGB. HUGE improvement....zero gas to face. None.
I also use the LMT Enhanced Carrier on my KAC 16" SR15 Mod2, unsuppressed, with Vltor A5H1 and Geissele Super42 Rifle Spring. Superbly well-running gun.
I haven't tried any of these, although i love the concept behind the LMT enhanced BCG. I use Bootleg adjustable BCG's. A different approach, but still effective. Great video. 💯
As far as I know the LMT Enhanced and Surefire weren't made for suppressors. They were made specifically for the 14.5 to reduce overall wearing. Back in early 2000s the military was finding the shorter 14.5 barrels were causing the bolt to wear excessively. LMT came up with this idea but Colt came back with a thicker socom profile barrel and putting a HD spring and o-ring on the extractor. The same issues came up back when they made the xm177 program and at the time Jim Sullivan wanted to re-design the system but never could. He noticed excessive gas and pressure build up that was way more than the 20 inch one he came up with. The surefire obc was what Jim Sullivan came up with had he been able to re-do the system. Overall I think the OBC is the better of the 2. I found it worked quite well and it is unfortunate that surefire isn't making any more of them, or as far as I can tell.
ya none of them were i believe designed with suppressors in mind. instead solving short barrel machine gun issues but it was interesting to apply it to suppressors. i never did a follow up on this but the delay in opening ends up decreasing the bolt velocity and the bolt ends up staying open a bit longer and "can" increase loudness at the shooter from what i observed
The LMT enhanced bcg cam path is longer in the straight part to allow more residual gas pressure to decrease before un-locking..The down side is these enhanced carriers will not run as reliable in the rifle system gas tube which is why the military rejected them..For short gas systems like the carbine length gas tube they work as designed..Jim Sullivan discussed this in his interview for Small Arms Review..He incorporated a longer/straight cut in the cam path for the Stoner 63 for this exact same reason....
I run LMT stuff.
Every and any issue is basically solved with use of either partial or full flo thru cans. I use an rc3, and a knights qdc, and never needed to change buffers or spring weights.
The Lantac does have larger vent holes angled forward for the same reason the LMT has 3 vent holes. As far as gas venting it does the same as the LMT it just doesn’t have the altered cam path or enhancements to the bolt.
21:45
If you're interested in that - I hope you've seen the new KAK K-spec down vent BCG by now. Thats what you're looking for.
You do not get more chamber pressure from going with a shorter barrel, you put more gas up the journal, back the tube and into the gas key. You only make more chamber pressure if you run a hotter loaded cartridge
i dont rememeber discussing chamber pressure, only barrel exit pressures.
Love this video, can’t wait to see more.
Leitner Wise LLC , long advanced carrier is out and about with the combat match bolt . Web site explains more. Thanks for this video !
AWESOME, will have to go check that out now.
LMT bolt is made of Aermet.
Icon Defense (a new company founded by “Mega” Mike Miller of Mega Arms fame, and Rick Olsen of Killer Innovations) has a brand new BCG with a modified cam path as well as an integral gas key. KAK actually just released a new “enhanced” BCG with sand cutters on it and the vent holes on the carrier are actually directed downwards rather than straight out. Apparently this makes shooting suppressed significantly quieter, and I imagine dirties up your mags quite a bit.
good info thanks
The cam path can reduce blowback, as well.
I think LMT finally released the material for the bolt, I recall reading somewhere that its Aeromet. The bolt lug they removed is supposed to load balance the rest of the lugs. Its generally understood that the lugs that fail most often are the ones neighboring the extractor. By removing that one lug opposite those two, it supposedly reduces the stress on them exponentially.
For me, due to the proprietary nature of their bolt, I opted to just buy the carrier only, and install a Colt bolt. Extractors are wear items as are the springs, and not being able to easily replace those is more concerning to me, as I will likely need to replace an extractor sooner than the entire bolt itself. And if one is worried about the extractor spring itself failing, you can use an upgraded Sprinco that has a much longer cycle life. NOTE:: chrome Sprinco silicon springs need lubrication as they are not as corrosion resistant as stainless, without lubrication they can fail prematurely in wet/salty environments, just lube your gun like you should be doing anyway and it will be fine.
Also Leitner Wise has now released their carrier I think. (Paul Leitner Weise is the LW of LWRC as I understand it, no longer affiliated.)
Lantac just released white papers illustrating a lengthened cam pin channel apparently
good info thanks
It's good to see your videos, there seemed to be a dry spell glad it's over
Never stopped on the patreon just haven’t been pushing anything new to the UA-cam side. Now im trying to start letting out a freebie once a week if i can. Hope to do more then that as well
I want to see a follow-up video showing the gassiness of a suppressed sbr ar15, such as a mk18, with the LMT vs. a traditional bcg. I want to know if the LMT will eliminate the gas issue with my suppressed mk18. An h3 heavier buffer, tuned down adjustable gas block, and gas buster charging handle helped SOME, but not enough.
what suppressor are you utilizing?
@@silencerstudent9381 surefire socom 556rc. No, I will not consider the OSS
Vltor A5H4 with the LMT E-BCG will greatly reduce gas to face. I use this on my 11.5" Supressed SBR And Specwar 556
ua-cam.com/video/LpNoZQcmL0c/v-deo.html at 9:20. Odd ball but you can see a bcm vs enhanced lmt
@@DBravo29er Would that still run well in freezing temperatures + field conditions? Serious question.
the lantac doesn't have a roller cam pin it's just rounded off .they say it's easier on the upper receiver just throwing that out there.good video by the way
Such a fantastic video. Watched it a few times now.
Aren't the Sharp XPB supposed to be incredible too?
Cool.. thank u for the schooling
Good watch thank you.
I want to know if the LMT bolt carrier slows down the rate of fire during full auto like the surefire Obc does
it should but probably not as much as it doesnt have the added weight the surefire does. i can tell you the lmt bolt velocity is deff slower
Any ideas what would be a good bcg for a 11.5 ?
Just go with any mid to high end bcg. Id run a midlength gas system
@silencerstudent9381 it's a carbine 11.5 , super duty by geissele
I’m a southpaw and I thought it might help keep gas out of my face when running suppressed is that true?🧠🤯🔫
get a stag arm upper.
What about JP enhanced or KAC?
Neither have altered cam paths. KAC uses a mil-spec carrier.
lack cam path changes
Any results yet?
been out for months at patreon.com/silencerstudent. check them out when you can
OBCs are discontinued. LMTs are unobtainium. I have both. ;)
Oh wow!
Just received my LMT - BCG today cost $500 from Primary Arms.
@@rudolphferdinand3634 Just got my Enhanced LMT for 300 off of GAFS ;)
do you really not see the 3rd hole in the lantach? hmm maybe watch a video with someone that knows what they are talking about ...
Bro where was it
wtf are you talking about
Lantac is a JOKE
Me and another guy tested out the surefire BCG and we ran it on a meticulously built 11.5 with a standard old direct thread Gemtech LE556 and that thing couldn't cycle didn't matter what ammo or buffer weight we put on it nothing! It had a standard Colt 11.5 barrel with colts own pinned cut down front sight post and a cult of a receiver and even with the full auto lower we used which was a cult as well it still wouldn't work correctly. We used both my own semi-automatic lowers which were several even with the PDW buffer system and stock, a standard carving stock and buffer, and the A5 system, and the M16A1 buffer system and none of them worked. It was upsetting