Echo 1 M4 with 11.1v Lipo

Looking for opinions on how an Echo 1 m4 would perform and how long that would last on a 11.1v 20C lipo with just the following upgraded from stock:

Upgraded polymer piston with metal teeth
Reeds AB Mosfet
O-ring Air nozzel
M135 spring
Matrix Magnum Motor
Ball Bearing spring guide

If the echo is is a reband of a JG, the new JG "enhanced" version are about the best V2 gb out of china, but they do have flaws. Don't run 11v lipo with out a mosfet the contact will not take it no matter what they say. I only use 9.6v and don't have any mosfets. Haven't had any problems with my newest ones and all i have done is reshim. I haven't run any spring bigger than a 130m in mine and the JG high power motor is doing just fine. I don't think the gb can handel a much bigger spring.Without major changes your rof is likely to be about 12-14rps but, i don't seem to need more than that anyway. the piston and heads are ok but they start lossing compresion pretty much from the get go and after about 30,000rds i've lost 60-80fps. Next week i'm putting and complet tune up kit in one to see how that works.

this is the tune up kit I got coming in. got it on sale of $45, but now they are sold out. i plan to put my130m back in. just tought it was a good kit for the price. good luckhttp://www.airsoftpost.com/product_info.php?cPath=24_81_412&products_id=28881