I currently have three Ace stocks including 2 on AKs (1 of which is milled) & 1 on a Daewoo DR. The Ace stock's lock up rock solid and are very comfortable. The upper tube is PVC for cold weather and they have a soft rubber butt pad that is now included (used to be an option). For optics use, they have a cheekweld adapter similar to the Galil style. I used the internal tang block on my MAK-90 and it was simple to install...cut the tang off with a hack saw, 2 swipes with the file and touched up with a Birchwood casey pen!! I say go for it!!