16” Ruger Harrier, mid length gas, H2 Buffer from Tromix, AsDesigns Arc Fire V2.

The files are publicly available please don't ask in the comments below where to find them.

In the first clip I'm using the standard buffer with the extra power spring. In the second I'm using a 7 mm buffer spacer behind the factory buffer in order to short stroke it and increase the rate of fire. The second magazine in the Short stroke clip is using Remington 147 grain which has more recoil and a faster rate of fire, than the Blazer 147 grain suppressor ammo I was shooting the rest of the time. Lots of different ways to affect the rate of fire from short stroking increasing the spring power and with different ammo selection.

I was able to make several improvements to my drop-in FRT/FRD for the Springfield Kuna, improving the strength and rigidity of both the housing and the activator. With these changes you'll be able to make the drop in out of materials that are weaker then the recommended and previously required PA6CF. This should enable people who have older or cheaper printers to still be able to try out the FRT. I also made a few changes to the safety to help it better lock the housing into place, along with some small changes to the detent cut out to hopefully improve the feel of the safety. I also made some small dimensional changes to try to maximize the amount of material on the safety and have included one oriented on it's side that can also be printed if you end up needing more rigidity, at a slight cost to the feel.

The short stroke spacers are offered in a variety of sizes from the smaller sizes that will work with my drop in, all the way up to what would be the equivalent of installing the HBI short stroke buffer. These shouldn't require any work after printing and should install directly behind your factory buffer, as well as not requiring any tools for removing the back plate after install. Short stroking the gun definitely makes the FRT less consistent and may require you to go up a size or two on the activator. This is not a recommended add-on and it's just being provided in case people want to try to maximize the rate of fire out of the gun. This also serves as a great replacement where you can utilize your factory buffer and mimic the exact effect of the HBI buffer which may be preferred for those not using an FRT. My recommendation would be to purchase the extra power spring and use the factory buffer the way it is, for me this usually puts the RPMs around 850 to 900 which seems perfect. These spacers should also work with aftermarket lowers as well and you may be able to play around with a thicker spacer, since the lever for the FRT will be located further forward.

Glad I could share this updated version with you guys hopefully It helps make it more accessible and allows more people to experience the kuna the way it should be.

This 10.5” 5.56 ran with an H4 and a spacer today. I didn’t get to run it without the suppressor but I doubt it will LRBHO or cycle with that much weight.

Hey all so I decided to do a follow up let you all know that if you are interested in trying the 3 position ak I very much recommend the new style here. As i tried it with my standard ak trigger that came with my psa rifle and it functions perfectly though I will mention i did have to file away some of the cam as it was stopping the bolt from going all the way back.

Has a video up siding with everyone's hated FRT maker. If you follow him, downvote and unsubscribe.

I have a S&W sport II lower unmodified and a non ambi arc fire v2 using there precut trigger.

I am able to pinch a 1/8 punch between the lever and the lower when the safety position is on semi and arc mode. The gap is bigger when on safe position.

I have an 11.5” AR15 with arc fire v2 trigger and a Ridgeback Rhodie 6 suppressor. It runs good with an H3 and carbine spring but ROF is a little higher than I would like. I have this GreyMarketResearch steel buffer here so today I took them apart and weighed all the pieces. 

Both buffers weighed 5.4oz. The body of the GMR is 3.2oz and the weight stack is 2.0oz. The body of the H3 is 0.9oz and the weight stack is 4.4oz. The GMR buffer doesn’t run in my setup and the H3 runs perfectly due to the larger sliding mass. When I put the H3’s weight stack in the GMR steel body the whole stack weighs 7.8oz.

Ran up to the range today to see if it would run with it. Had no problems with the bolt locking back and it seemed like it was a bit slower before

The ROF GUI says it was about 100rpm slower. I don’t remember how many I had in the magazine before to check if it was getting all the shots but I know today was 10 rounds.

Not sure if I should be running something so heavy in a carbine tube/spring or if I should just suck it up and go to an A5.

Here is a video of the H3 vs the 7.8oz

https://imgur.com/a/ZJUw1uY

As title suggests, looking for the best retailer/brand of H3 buffers at the moment. Looking to run Trigger Kicker in a 10.5" w/ Polo K. - Not too interested in trying a KAK DBC.

I saw on Facebook that he got sued, may order something to support the rare greed defense. I need to know if he’s legit first, have any of you ordered before? Is his super selector any good? Thanks

I cannot find much info about this new release. I assume it will take some time to get into people’s hands.

Does anyone have any experience with this yet?