Ive been looking around for a while afor a replacement for my src sr4 handguard. The Magpul standard size dosnt fit, and the dboys m4 handguard dosnt fit either, so not ive got 2 handguards that dont fit on my m4 :/ does anyone no where i can get a handguard that will defonatly fit the src sr4 or how to modify one so i can defonatly get it to fit nicely? please help!