SIGforum.com Main Page The Mason-Howe Rifle Room An interesting new roller delayed blowback 9mm coming: Springfield Kuna.
Main Page The Mason-Howe Rifle Room An interesting new roller delayed blowback 9mm coming: Springfield Kuna.Go | New | Find | Notify | Tools | Reply | |
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After literally having to beat my Obsidian off the trilug on my HK I'm wondering how well that small amount of access in front of the handguard really works to get it off?? “So in war, the way is to avoid what is strong, and strike at what is weak.” | |||
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Spread the Disease |
If you have a small amount in the front, you ALWAYS have to break it in before you try to get it off.  My Dead Air trilug did get easier after a lot of use. ________________________________________ -- Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past me I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain. -- | |||
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Frangas non Flectes |
Well, that was quick. https://www.instagram.com/reel...gsh=amY5NDJ1ajk4dDc2 Looks like Nexus not only beat Lingle to the punch, but also got a Super Safety to work in the Kuna. There’s some guy who supposedly figured out how to do it with the Stribog also using trip sleds or some such. I know, you can do it with the MP5 as well with the Lee Sporting Lower, but I’m still gonna say I think this might be a better incarnation of it because of the Scorpion magazines. Still, it’s Nexus, so they’ll probably want $500 just for the fucking lower itself. ______________________________________________ "If the truth shall kill them, let them die.” Endeavoring to master the subtle art of the grapefruit spoon. | |||
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| Member |
I finally saw that video you referenced, and looking at the SP9A3 that I picked up yesterday, it isn’t true that the recess for the roller pin is aluminum. The depressions that the roller locks into are steel, and in fact are the top part of the block that has the forward takedown pin hole. There are cutouts in the aluminum receiver rail for that steel block to slide up into. You can clearly see block at 7:25 in this takedown video. It’s definitely steel as verified by a magnet. Not sure where that guy was getting gouging in the aluminum rail, but it’s not where the rollers sit when the bolt is locked. I have heard that the receiver rails can get damaged at the rear if the bolt slams hard against the buffer. When that happens, the inertia of the locking block keeps it moving back, which then pushes the roller pin downward, hitting the top of the rail. I can definitely see that happening, but don’t know details of whether it’s primarily an issue if running heavy load suppressed, or whether it’s more of an issue with the shorter, harder stock buffer or the longer, softer HBI buffer. | |||
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Looks like HBI just dropped some upgrades for the Kuna. Short stroke buffer, safety levers, springs, stocks, Oh my! Video on the new HBI buffer. This message has been edited. Last edited by: Dwill104, | |||
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Member |
Or, get it in before you break it off? | |||
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| Member |
Since I very recently acquired a 9mm bog, I decided to do a direct comparison of the two at the range.  The SP9A3 definitely has less recoil than the Kuna. Should be mentioned that my SP9A3 has the 40 degree locking piece and HBI short stroke buffer, and the Kuna also has a short stroke buffer, as well as the increased strength recoil spring that HBI included with the Kuna buffer. Have to say that I also prefer the trigger on the Stribog over the Kuna. The Kuna trigger is OK on pull weight, but has a fair amount of slack and creep. The SP9A3 trigger is also good on pull weight (have the HBI springs installed), but is like a single stage trigger with almost no slack and little creep. Definitely a lot crisper than the Kuna trigger. | |||
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| Frangas non Flectes |
Reassuring and great to know! 
On further reflection, I think that guy is either a shill or a clown, I'm not sure which, and I'm not sure I care, but I'm not going to be watching any more of his videos.
Yeah, pretty much all the comparisons or feedback I'm seeing from people who own both is that the SP9A3 is the smoother shooter, even stock. When you add in the 40 degree locking insert and the aftermarket buffers, the gap widens.
It's... even better with a Geissele.  ______________________________________________ "If the truth shall kill them, let them die.” Endeavoring to master the subtle art of the grapefruit spoon. | |||
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| Member |
In case anyone is interested, SA is selling the factory Kuna stock. Looks pretty good!   | |||
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Member |
I find the Kuna to be the better looking option, at least in photos. Did a bit of looking and was surprised to see the Kuna & the Bog are pretty close in price. Expected, for no tangible reason, for the Stribog to have a more premium pricetag. Haven't seen either in person at any LGS I've happened into recently. The Scorpion was on my shortlist until the Kuna came out. The Enemy's gate is down. | |||
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Raptorman |
I just picked up a CMMG Banshee MK4 with the radial delayed blowback system in it. Someone put a KynShot hydraulic buffer in it for some reason. This is the Gen 2 with the regular modified AR bolt with the ejector pin. The updated version of the MK4 has a fixed ejector in the upper. Of course I put a Marzygiggle in it. We'll see how it performs hopefully this weekend.  ____________________________ Eeewwww, don't touch it! Here, poke at it with this stick. | |||
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| Sigless in Indiana  |
You are going to love it Marzy. The hydraulic buffer is probably because of arfcommer Amphibian's recommendations for a slower ROF on a MG lower. I have never messed with the kynshot buffers but I suspect you will dig it. I have not had the ejector issues that some CMMG users have reported, but I do have a 10 pack of the MK10 heavy duty ejectors springs on hand in case I start killing them. I recommend you snag a few just in case. Let us all know how you like it! | |||
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| Sigless in Indiana |
I have never had trouble removing my can from the 3 lug. But I don't think I have taken it above 500 rounds without removing it. | |||
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| Raptorman |
The springs are already on the way! I ordered them as soon as I opened it up and saw it's not the new model. ____________________________ Eeewwww, don't touch it! Here, poke at it with this stick. | |||
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| Member |
I recently swapped my old CMMG Guard (what 8” Banshees used to be called) to a Kynshot buffer and Tubbs flatware spring because there was some internet lore that it would make the recoil even more gentle than it already was. Unfortunately, I had some reliability problems with the combo, so I went back to the standard round carbine spring, and that seemed to fix it. Since mine is old, it has the original spring loaded ejector, and although I never had any problems, I picked up a fixed ejector retrofit kit and recently swapped it over. Far more expensive option than just replacing cheap ejector springs, but it’s peace of mind. Plus, the FE bolt also has a revised angle on the bolt lugs that’s supposed to be better. Obligatory photo.  | |||
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Member |
I’m kinda digging that what was old is new again. Seems like more roller delayed operating systems are hitting the market and I think that’s cool. It’s a pretty cool system for pistol caliber firearms. I’ve always been a fan of MP5s in particular (except when it comes time to clean them) and pistol caliber carbines in general. Especially with the surging popularity of forced reset triggers I think now is a pretty good time to be a roller delayed blowback fan. “It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.” | |||
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| Sigless in Indiana |
I have a legacy ejector bolt with the updated 50 degree bolt angles. You can tell which bolt you have. The newer ones are marked with an engraved numerical 50. It does seem to shoot a little softer. But I never had any trouble with the original bolt. The FE conversion was a little too salty for my taste, but I understand why some have opted to go that route. Despite several thousand rounds on both bolts, I haven't had an ejector spring fail yet. Just lucky perhaps. I love having the same manual of arms of my 5.56 ARs. It just feels natural. So smooth with 147gr subsonic ammo. I do think the CMMG radially delay system is the sleeper PCC that doesn't get as much attention as it should. Really nice being able to have one SBR lower that can do 9mm with endomags and any of the other regular small frame AR calibers. | |||
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| Sigless in Indiana |
Very nice. | |||
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| Raptorman |
Here's the Banshee running. I put 500 through it today and it just ripped. Not the first problem. ____________________________ Eeewwww, don't touch it! Here, poke at it with this stick. | |||
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CAPT Obvious |
That looks like a hell of a lot of fun. | |||
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SIGforum.com Main Page The Mason-Howe Rifle Room An interesting new roller delayed blowback 9mm coming: Springfield Kuna.
Main Page The Mason-Howe Rifle Room An interesting new roller delayed blowback 9mm coming: Springfield Kuna.© SIGforum 2026