my ics just broke after more than 10 000 bbs.....and it was my fault.....the only difference in the mag is that its a full size replica tm mags ar a bit shorter
it is verry easy to upgrade the spring due to its split design.....my option would be to get the ICS M16 a4 and just upgrade the spring cuz the stock gun shoots very slow and only use 8.4v high mah batteries....I put a 9.6 in mine and it burnt out the electrical switch :oops:

G&P M4 for me. :D