||The box mag is a great tool to have but I would still keep mid/standard cap P90 mags for a few reasons. But heres the pros and cons I found
† Plenty of ammo
† Good for mid-long range conflict (fighting in the woods)
† M4 Hi-Cap mag compatibility and availability. (And you only need one good one)
† Decent Feed
† Simply dump the bb's in the top reservoir
† Looks sexy
† May just be my mag, but you have to wind it alot because of the slight more distance from the top end of the m4 mag to the P90 receiver is meaning a full wind may provide you around 20rds before you have to wind it again,,, basicly ALOT of winding.
† Leftys of course have problems
† If and when you have a jam, it takes alot of effort to save the rounds that will fall out. Its nearly impossible to take the box mag out without dumping 50-150 bbs on the ground.
My suggestion is to keep mid and standard caps with little or no winding when involved in CQB battles. Plus in CQB I highly doubt you will need 1500 rds unless you really give your gun a run for its money. When you switch to woods and longer distance engagement battles, this box mag is insanely helpful. I highly suggest this box mag though.
Rating: [4 of 5 Stars!]