Yeah. The BOX MAG! They are the best p90 buy ever. Unless like me you play Milsim 😂 they legit can turn a p90 into a LMG. It feeds amazing, and holds like 2,000+ bbs. Mid caps are a pain for p90 cause they r huge, while high caps tend to not feed well. Don’t own a p90 unless your gonna buy the m4 box mag thingy. That’s my advice. (Unless you play milsim again) Anyone else use them? Lmk below! Check out my basic YT video going over it @ Callsign Dell