If you are looking for M4 High-Cap Magazines, then these are what scream 'HIGH CAPS!!!' as each magazine can carry up to 850-rounds. Get the 5-piece pack at RedWolf Airsoft... "Socom Gear have released a FULL METAL 850 round Hi Cap Magazine for all M4 and M16 series. This would be brilliant for outdoor skirmishes as this package comes with 5 magazines which is a total of 4250 BBs. That's quite a fair amount! It may not fit in a single mag pouch but it'll certainly fit in a dual mag pouch!"