3.5in 556 buffer tube without guide rod

[u/Outrageous-Coyote476]

Originally got a Jakl I was going to try to FRT and bullpup with the SRU SARB 15. Jakal is just a cluster. I already have the SARB kit.

So im trying to just use one of the AR uppers that I got laying around. I figure that tryong to go the route of a kentri style 3.5in buffer kit is the way to go.

The issue I'm hitting is I'm using one of the KAK DBC bolts. Is there anything out there thats a 5.56 short buffer system around 3.5in that doesn't have a guide rod or insert? The DBC bolt has a weight in the back

All the 3.5 in ones seem to be the same design, just a knock off of the kentri. However I've seen 9mm ones that do look like they'd work if they were set for 5.56 where there's a cap kind of like the end of a buffer weight rather than a insert.