Originally Posted by technique
Is that illegal to use? A lot of people have Virgin kits that might come with those. I have not seen it brought up. I have only seen Oaklanders post on FCG parts.
Based on that letter, I wouldn't use a slotted rail. I didn't realize that the virgin kits came with them. It may not have been mentioned by guys like Oaklander since the majority of people use demilled kits, in which the slot rail isn't included, and maybe they didn't even know that virgin kits included it.
I'd suggest doing some searches on some of the AK-centric forums to see what they say about using slotted rails in semi-auto builds.