Well I tried everything from forming a new lug 3B from epoxy, but it snapped off after 2 shots. Tempted to use some quiksteel instead, but that would be a last resort.
Looking up and down for compensators to fit, and there are no other option other than to have one custom made from ProG4 which is out of my budget. So after consulting Madmax and Illusion, decided to try "machining" a flange at the muzzle end of the outer barrel to pull the outer chamber into battery when the slide snaps forward.
Searching online for what to use as a flange, I couldn't find something suitable that could easily be bought off the streets. Then, my gf mentioned something about my rings, I realised, holy sh*t, a ring! Immediately I grabbed my outer barrel and tried to fit my ring into the outer barrel. It wasn't the right size, but I got the solution.
I marked a line on the outer barrel where the correct amount of protrusion from the slide should be so I know the right width for the ring to use. Then I brought my barrel to a street market that sells cheap jewelry, and found a size 16 silver ring. It was a snug fit, and I didn't want too tight a fit that I couldn't put epoxy in between.
There were steel jewelry as well, but I was afraid that that would into my aluminium slide's muzzle opening like the steel chamber did, so I'll leave that as a last option.
So I went home proceeded to file a groove on the muzzle's edge, and sanded the inside of the silver ring to roughen up the surfaces to be bonded. Then I mixed up some 2 part epoxy, and placed a strip of it in the groove I made in the outer barrel. Then I slid the ring over the muzzle's end, and gently hammered it in with a rubber mallet, as silver is pretty malleable.
After 15 minutes when the epoxy had cured, I chambered the edges of the ring with sandpaper, buffed both barrel and ring with a emery board.
Now I have bling on my hi-capa 4.3, and it works. Pulls the chamber into battery, and the silver doesn't eat into the slide as steel would. I cut the KA 150% recoil spring by 3 coils just to be safe, as I think that was probably a contributing factor to the destruction of my slide.
Here's some pics.
Wonder how long that would last.