[Hectic]

Okay so i grabbed me a 417 now I am going to build a DMR type rifle out of it. Here is what i have in mind but also have some concerns.
SHS 13:1 gears (not going for rof, just trigger response. Will have the merf set to 30% rof if i cant semi lock it somehow)
SHS blue piston 14 metal tooth
stock spring (m120-130ish)
Merf 3.2
11.1v 15c lipo (may custom make a bigger one, can fit 2 buffer tube lipos in the 417, 22.2v anyone? Lol jk)
piston head (pom)
Sorbo pad
455 or 509mm inner
smooth hop rubber, bridge tensioner..

My concerns, will the gears, piston withstand the 420+fps?
or do i need to go lonex piston (no stock atm) and some sigtek gears?
I i can get it around 420-440fps and 25+rps (before reducing it with the fet) id be happy, lookin to get near instant trigger response and the ability to run .36-.40 bb's for longer range engagements.
Thanks in advance tech gurus!!