mp5 metal body

[kmsakura]

I recently purchased a TM mp5 sd5 from a friend for a fair price, 400 dollars, with magazines, batter, charger etc. The gun itself is almost completely stock with the exception of metal bushings, but i am interested in getting a metal upgrade for the externals of the gun. iv been looking around for quite some time and iv only managed to find metal receivers made by classic army and ics. From what iv read classic army parts are not very accurate and ics kits are apparently very fragile. my question is does another company, such as guarder or g&p make a metal receiver kit for the mp5 that would be more durable and accurate. it seems odd to me that they would not capitalize on such a popular platform, i heard a rumor about a mosquito molds kit but iv never seen it for sale. Any help would be apreshiated.