Heres one if you ever find a AR mags with mag cuts on both sides and wonder why that is .. Well I can answer that for you .. It is due to this gun Armalite_AR180_FoldingStock.jpg
The AR180 or ar18 ... It takes normal AR mags buuut they have to be cut on the oppiste side of the normal AR catch due to the mag well .. Plus they might have to be sanded to fit
For some thank god good reason a handful of companies are still making mags that are dual cut ... So if you ever find some mags or one marked Armailight or Sterling England you know what they are ... The good news is that most AR18 mags esp org factory ones will work in both a AR or ar180 ...
Weirder still are some of the ramlines made years ago that fit the AR18 and the mini 14
And if you do find any let me know I am looking for some Factory org mags are pretty rare