If the original poster is still active that's a valid question to ask. people are bad at follow up. If the OP hasn't been on line since the day the question was asked yeah dead end!
The Springfield M1 appears to be a rebrand of the Marushin/King Arms M1 and has been sold as a 4.5mm air gun and a 6mm Airsoft gun, As these links are stating airsoft they both are 6mm
THIS ADVERT IS 'UNCOMPLETED' - THIS MEANS THE ADVERTISER HASN'T BUMPED THIS LISTING, BUT IT COULD STILL BE WORTH CONTACTING THEM.
For sale
As new
WTS Tokyo Marui Advance Block 26 Frame, Brand new, Side, rear sight, inner/outer barrel, Compensator, lower receiver with secondary safety ( no other internals) £30 posted and Paypaied (will be sent in the original box.)
Cheating unless allowed by the rules, but even then a dick move. You are just going to have people spend all the game frequency hopping and you are going to piss away the game trying to listen rather than play.