MAG 100 Round Airsoft Mid-Cap Magazine for SIG / 551 / 552 Series
(Box Set of 2)

"Good magazines for the price, but require some modification to fit both ICS and G&G branded SIG series guns. If you have a file and about 4 minutes of time, you can get this working for either of those guns. My only complaint is that you cannot remove the nubs without the help of a file/dremel/hand saw, but that is rectified by spending some more time on the magazines. These still have the best capacity of any of the SIG midcaps, and I would recommend them to anyone who needs it.

"Ok guys, I have written a review on this product before. I am writing another for clarification on the miss-feeding issue in my JG S550.
I stated in my last review that they needed some spray silicone oil, which they do, but they also need to have about 500-1000 rounds run through them before they function properly. NOTE: When you use the spray silicone oil you need to let the mags wick (basically dry before use) for about a day on a towel.
You also DO NOT need to OVERLOAD them. Your average speedloader holds about 110 6mm bbs. The fake markers on the back of the mag that show how many rounds it holds, if it were a "real gun", will be your indicator on where to stop loading. You also have another indicator on your speedloader, if the markers go from 30-90 rds, to show you where to stop loading. If you put the mag up to the light, while loading, you can see the bbs being loaded in and you want to stop just at the 30 mark around the bend or a little past. If you use your speed loader, to gauge how many, you will stop just below the 50 mark. That should be around 65-75 bbs. DO NOT put more than that in the mag because it will start to separate at the top of the mag.
Just so you know I run these in my DMR so the mags are perfect for my setup.

Pros: Durable
No miss-feeding after break in
65-75rds is not bad
They come in a 2 Pack
They do not need modified in a JG S550
They link together nicely
They fit linked together in a dual M4 mag pouch (made by Phantom that I bought here on Evike.com)

Cons; They do not hold 100rds (at least not without damaging them)
They need breaking in (which I don't know if this is much of a con because I have not owned a mag yet that has not)

Overall I suggest you buy these mags if you own a JG S550 and are looking to run this in MILSIM events.

"Bought this mag to replace the cranky hi-cap that came with my JG 552. This mag fits great, feeds great, and is much, much tougher than my old hi-cap. I have only been able to get 60-70 BBs into it before my speedloader gives up, but I'm still very pleased with it.