SACair Forum

I was thinking of dropping some internal parts into my CA M4. I was trying to find any info here about Bore Up sets and couldn't find anything. Can any of you tech's out there tell me what the benefits of a Bore Up set in my M4 would do?

Moves more air then a standard cylinder/head, piston head combo...They work better with longer barreled AEG's but I had a set laying around, put it in my kitty kat sr47 with a new piston head o-ring and picked up about 20fps..

Sweet, thanks Ukau!