High capacity magazine question

[Dave Block]

I'm too cheap to consult a real lawyer on this (& they probably wouldn't know anyway) so I'll toss it out to the experts here. Is it legal for me to purchase/own an original unmodified high-capacity magazine (i.e. Bren, MP-40, etc.) if I do not possess the weapon itself or have access to same? I have the opportunity to purchase some original, unmodified magazines & don't want to put my registered weapons in jeopardy, nor do I want to destroy a potential collector's item.

TIA, Dave