For: Echo 1 100rd M4/M16 Dogs of War Metal Mid Capacity AEG MagazineProduct Information:
I bought 2 of these Mags from ASGI for my Echo 1 614 (HK 416 model, HK's version of the M4) and they worked perfectly. Here is a pro-tip i learned from these mags and my friends MP5 Dogs of War mags, use Silicon spray in the tube and use a ram rod to work it into the spring, this will save you from a few horrible mag jams.
Holds 100 rounds
Doesn's shuffle around like Hi-Caps and no winding springs
Fits my HK 416 when all other mags would not
Have to use silicon when you first get them, but thats all mags.