The siaga has to use the siaga hand guard. The top cover mount can not be specific us palms as the gas tube is octagon vs a standard gas tube. I received the universal mount and it fit well till the top cover went in place. I returned it and now waiting for the correct hand guard. Which brings me to another point. I used a spread sheet for 922R compliant, by replacing the hand guard I now fall out of be compliant with the code. A few of the things on the list don't fit for the rifle and never could. Such as muzzle attachment. Where I live I can not convert the rifle or it would be a big bad assault weapon so muzzle attachments are out. I have a total of 14 parts, 4 domestic parts would place me into being compliant. I was thinking hand guard, butt stock, hammer and trigger would be the easiest to upgrade to make compliant, I know the magazines would change that as well but no one that I am aware will ship a 10 round magazine or even parts to make it 10 rounds and no american made 10 round siaga magizines.