I've got one of the Special Interest Arms kits.
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Disclaimer: I assembled it myself and broke the ejector*
It's a neat rifle, albeit a little quirky. During assembly I damaged the ejector and removed it from my rifle. As long as you are not being a sissy when running the bolt the majority shells eject fine, despite the demonstration in the video I'm usually 9/10 rounds ejecting right. I'm not really impressed with the kit's standard ejector stud anyways and if I was going to do this again I'd send the receiver to Richard at SIA to have his improved tig welded one installed.
The other quirk seems to be mostly magazine related. I've got Wilson Combat 47D's, Chip McCormic Powermags, and a Remington 1911 mag. The feed lips on 1911 magazines are seemingly too short and if you are not running the bolt like you got a pair the rounds can slip past the feedlips and miss the extractor, thus becoming airborne. The fault in the design of this conversion, in my opinion, is the distance the rounds have to travel from the time they leave the feedlips to being chambered. It is quite a long distance and requires a lot of inertia to maintain. My understanding of the original DeLisle carbine is that the barrel's chamber actually come quite far back into the receiver and there is no long distance for the cartridge to travel
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Also, I've also yet to get this gun to reliably feed with more than 5 rounds in the magazine. But like I said, I believe this to be a magazine issue.
Despite all of it's quirks it is one of my favorite rifles to shoot and will be in my collection forever. It's surprisingly quiet. Minimal recoil. I can run it well enough that I would not hesitate to take it out rabbit hunting.