Spring guide hiting cylinder

Hello. I am currently upgrading my sniper rifle and just bought a new spring guide; however, it is grinding and chewing up my cylinder and I can't figure out why. It is a 7mm angel custom guide and is with a 7mm stock spring and with the stock piston. I have spent several hours trying to figure out why but with no luck. My rifle is a TSD SD700 which is a VSR-10 clone, and all of the other VSR cylinder parts work fine with it as long as I use the plastic spring guide.
Thanks for any help you can provide.
P.S. I hope this goes in the VSR section, mods please move if it doesn't.