M1 GARAND CHASSIS SECRETS

Since I am new to your EBR's I was hoping somebody could refer me to a sections checklist or a set of spec's for the several mod's of EBRs. I see fellas developing them and even just after taking a look at SageEBR.com I'm not really absolutely sure what differentiates different mod's or whatever they entail.SAGE just finished a batch. Let me know i