The mags that armalite model use are kind of same for every model, and the DPMS have some part TM compatible, so the mag should be fine, and the mag on the link you posted are TM compatible, so there shouldn't have any problems.
Being 14 myself, i can't know everything about airsoft, but ive read many thing to know alots, but let hear what other people will say
Edit: Though i hope you know that the mags in the link you provided are made of ABS platic, not metal.
Oh and welcome to ASC buddy