1. buffer tube size lipos are avaliable in market, u dont need to change the original buffer tube if u juz wanna fit the lipo inside the buffer tube, but u need to replace the original curly power cable into a straight one. BUT if u wanna use another non-comm'l spec butt-stock, that's another story.....BTW 7.4v lipo will be good enough for M110, we use 11.1v for M130 or above usually!
2. non pts version will recommand, but about the mod of UBR for PTW is too complicated, i'm not qualiflied to give u the answer about that...
3. the answer is NO, if u dont have any tools for the charllenge kit, then find a PRO to assembly for u, juz cost u few hundreds labour fee.....
I'm a Manufacturer , NOT a Dealer......
I buy more than I sell.
I'm merely selling my collections or extra items.
I had to buy to get what I want.
