Uzi
.308 Win
Then I would have to disagree with this statement
There are plenty of people who have converted their original configuration SKS to accept (detachable) magazines.
You're confused I think.
The ability is what a rifle's current function is able to do, so if it's fixed in place, nothing comes out or goes in and it's not able. The capability is what a rifle in this instance would be constructed to achieve, which is not regulated in this instance and therefore not a concern in the debate. You guys need to reread the thread again, because you're asking questions that have already been answered.