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Lima Six Belt fed AR15 Build 300 BLACKOUT SUBS PG 24 (Page 33 of 35)
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Originally Posted By TonyRumore: On my personal unit, I'll be running a 12-13" barrel with a pistol length gas system. Of course when we sell barrels to the public, they will have short dwell times, since that's what most ARFCOMers want. Tony We should talk. There is a contingent that want good velocity, longer dwell time and a slower rate of fire for reasons. |
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Originally Posted By MGVINCE: Great video.  Excellent update.  That hand guard is bad as looking. I’m buying the complete LimaSix upper, but when Red Right Hand offers the hand guard assembly as a component, I’m definitely getting one. I had not paid a lot of attention to the RRH planning since I didn't like their older RPK things very much compared to my own Bump-Lewis and then FRT-Lewis. But this video changed my mind A LOT. Really nice package. Bayonet hell yes. New handguard is awesome. I know it will be over the adjustable block, but it would look amazing as a 17" handguard for that 18" barrel! Or longer for a 20" barrel with 3 heat sinks? Then we just need a 4" diameter can to match!! Perfect Lewis front with a belt instead of pan. |
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Originally Posted By v188: I don't remember seeing this answered yet. Â Will this work with the Arizona Regulator 3 position selector FRT? Â I know we only have answers from the Beta testers and Harvey. Â But, does anyone know. Â Saves me taking my Lakeside LM7 off the 16. Â BTW it works great. Â Hoping the LimaSix works as well. It has a full auto profile bolt carrier, so it should work with essentially any trigger. I realize the Arizona Regulator is not a trigger, but that part of the gun is identical to an AR15 so it should be fine. |
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| I wasn't too interested in the RRH builds. Or his handguard when I saw the Pic of the extrusion. But i have to say that it actually looks awesome assembled, especially with the carry handle. I have a couple of the pic rail carry handles for my RPD and my L6 build, but the RRH setup looks nice. I might just upgrade when he makes them available down the road. |
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Originally Posted By Type7SOT: It has a full auto profile bolt carrier, so it should work with essentially any trigger. I realize the Arizona Regulator is not a trigger, but that part of the gun is identical to an AR15 so it should be fine. Originally Posted By Type7SOT: Originally Posted By v188: I don't remember seeing this answered yet. Â Will this work with the Arizona Regulator 3 position selector FRT? Â I know we only have answers from the Beta testers and Harvey. Â But, does anyone know. Â Saves me taking my Lakeside LM7 off the 16. Â BTW it works great. Â Hoping the LimaSix works as well. It has a full auto profile bolt carrier, so it should work with essentially any trigger. I realize the Arizona Regulator is not a trigger, but that part of the gun is identical to an AR15 so it should be fine. IIRC you said this feature in the upper is longer than a standard upper? Since this is what constrains the AZR axially, I would think if it's much longer the AZR wouldn't work, or wouldn't have reliable timing. 
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Originally Posted By Kuraki: IIRC you said this feature in the upper is longer than a standard upper? Â Since this is what constrains the AZR axially, I would think if it's much longer the AZR wouldn't work, or wouldn't have reliable timing. https://www.ar15.com/media/mediaFiles/125898/Screenshot_2025-10-14_145241-3641809.png Seems like it'd be pretty simple to 3d print a spacer that keeps the AZR in place. |
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Originally Posted By hawkin: That guy is off his rocker. We should look at other avenues. Originally Posted By hawkin: Originally Posted By Kuraki: Certainly possible. Â AZR might be convinced to make a lima6 specific housing as well. That guy is off his rocker. We should look at other avenues. That's putting it mildly. Don't why one would bother with the regulator when so many other good options are available. Red Right Hand's recent Lima 6 video was enlightening. Cool to see this project moving like a locomotive. |
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Originally Posted By Kuraki: IIRC you said this feature in the upper is longer than a standard upper? Â Since this is what constrains the AZR axially, I would think if it's much longer the AZR wouldn't work, or wouldn't have reliable timing. https://www.ar15.com/media/mediaFiles/125898/Screenshot_2025-10-14_145241-3641809.png The outer part of that cutout is the same as mil-spec. It's the inner part that was lengthened. I don't believe that will affect anything. |
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Originally Posted By mPisi: I had not paid a lot of attention to the RRH planning since I didn't like their older RPK things very much compared to my own Bump-Lewis and then FRT-Lewis. But this video changed my mind A LOT. Â Really nice package. Â Bayonet hell yes. New handguard is awesome. Â I know it will be over the adjustable block, but it would look amazing as a 17" handguard for that 18" barrel! Â Or longer for a 20" barrel with 3 heat sinks? Â Then we just need a 4" diameter can to match!! Â Perfect Lewis front with a belt instead of pan. Riflespeed makes longer options for the adjustment collar, you can probably just swap the one that comes on the RPD to the longer ones, unless the bayonet lug makes it impossible to remove the collar. |
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If you are completing a build kit and plan to run a Midwest Industries quad rail with a Riflespeed gas block, take a look at this: https://limasix.com/community/technical-discussions-help/midwest-industries-quad-rail-modification-jig-for-riflespeed-gas-blocks/#post-260 |
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Originally Posted By WyattC: Riflespeed makes longer options for the adjustment collar, you can probably just swap the one that comes on the RPD to the longer ones, unless the bayonet lug makes it impossible to remove the collar. I honestly hate that RRH is calling his build the "recce RPD." Its just gonna make it that much more confusing when im searching for RPD parts or info. And it has nothing to do with the original russian acronym RPD. I get it that they are both intermediate caliber, Fixed barrel, beltfeds. But that's like calling it the recce m249 |
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Originally Posted By SGT-Fish: I honestly hate that RRH is calling his build the "recce RPD." Its just gonna make it that much more confusing when im searching for RPD parts or info. And it has nothing to do with the original russian acronym RPD. I get it that they are both intermediate caliber, Fixed barrel, beltfeds. But that's like calling it the recce m249 Yeah, I get it. I think the idea is that there is no American Equivilent to the RPD, so for awhile he was calling it the "American RPD". And I think he made it the RECCE to fit with the rest of his branding. |
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| You guys working on nut sack specific lowers for this should make it so the magazine button depresses the locking latch for the nut sack from the top so you can remove it with your off hand without having to depress the latch. |
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Originally Posted By Type7SOT:
Rad!!! This video just shows how creative you guys can be when it comes to texturing and work holding. I didn’t expect to see these being held like that. |
Looks awesome. Hafta get him to incorporate a bolt hold like November 5 is planning for his Hydra front end and he'll have a real winner.  A Lower for the Lima Six Belt Fed Upper |
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Originally Posted By Kuraki: That's interesting. Â I did not expect port size to grow with barrel length. It doesn't, it grows with gas system length. For a given gas system, it will be smaller as the barrel gets longer. The reason rifle length systems require large gas ports is because the port is so far from the chamber that pressures are much lower. |
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 Lima Six October 2025 Production Updates |
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Originally Posted By Type7SOT: First release of gas port info: https://i0.wp.com/limasix.com/wp-content/uploads/2025/10/Lima-Six-Gas-Port-Sizes.jpg?resize=673%2C786&ssl=1 Are you going to test rifle length systems longer than 20”. I would expect port size to go down a good bit with the 24” rifle gas. The rifle ports are getting kinda big |
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Originally Posted By tommyidone: Are you going to test rifle length systems longer than 20”. I would expect port size to go down a good bit with the 24” rifle gas. The rifle ports are getting kinda big Yeah I'm sure going longer will help. I agree, we are getting to the limits of what you can do with a rifle length system. Rifle gas ports are already pretty large, around .093-.096 on the examples I've seen. I personally think mid 18" is the sweet spot for this system. But yes we will test that eventually and update the chart. |
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| I'm working with the machine shop, everything was good on the hydra adapters except that they don't fit hydras. I called out a spec of .196 +/- .005 for the groove that slides onto the hydra. They cut them to .172. I'm sure they'll make it right, but it's going to be further delayed. |
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Great update Harvey. I can imagine the logistics of coordinating all the subcontractors is incredibly stressful. There is always going to be delays that you will have no control of. I hope everyone that has ordered the kit or complete upper, will keep that in mind and be patient and understanding. |
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Originally Posted By November5: So close, yet so far https://www.ar15.com/media/mediaFiles/173129/IMG_3688-3646615.jpg Looking good, tho. Are they hard coat anodized? Also, what other small parts will be required? (Other than front takedown pin components). Lastly, are you planning on, or considering, a spring-detent style trigger guard pin to go with it as well? Edit: nevermind, I missed the screw for the trigger guard... |
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Originally Posted By ABabyEater: Looking good, tho. Are they hard coat anodized? Also, what other small parts will be required? (Other than front takedown pin components). Lastly, are you planning on, or considering, a spring-detent style trigger guard pin to go with it as well? Edit: nevermind, I missed the screw for the trigger guard... Originally Posted By ABabyEater: Originally Posted By November5: So close, yet so far https://www.ar15.com/media/mediaFiles/173129/IMG_3688-3646615.jpg Looking good, tho. Are they hard coat anodized? Also, what other small parts will be required? (Other than front takedown pin components). Lastly, are you planning on, or considering, a spring-detent style trigger guard pin to go with it as well? Edit: nevermind, I missed the screw for the trigger guard... ETA: Yes, hardcoat anodized. Upper half is 7075-T6, trigger guard is 6061. |
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Originally Posted By November5: So close, yet so far https://www.ar15.com/media/mediaFiles/173129/IMG_3688-3646615.jpg That looks really good. |
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Originally Posted By FantasticPlastic: That looks really good. Originally Posted By FantasticPlastic: Originally Posted By November5: So close, yet so far https://www.ar15.com/media/mediaFiles/173129/IMG_3688-3646615.jpg That looks really good. |
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Originally Posted By November5: So close, yet so far https://www.ar15.com/media/mediaFiles/173129/IMG_3688-3646615.jpg Bummer recut and send out to anodize again. Hopefully not more than a few more weeks. |
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What about the DPMS style AR-10 lower? The rear section has the same profile of AR-15. There is also the Colt 901 that can use an adapter to run 5.56 uppers? Then with a lengthened magwell adapter, all of those using the MGI style lower wouldn’t need to replicate what they already have for an activation system. Just a thought. Scott |
Lima Six Belt fed AR15 Build 300 BLACKOUT SUBS PG 24 (Page 33 of 35)
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