You're correct in that the Indian rifle is a copy of both the inch and metric patterns. They didn't want to pay the royalties demanded and purchase manuf. tooling from FN so the Indians purchased both inch and metric examples and used them to "reverse engineer" a working set of prints. The end product was a true FrankenFAL. Good idea to send that lower back in exchange for a proper L1A1 or SLR. Word is that Indian parts are not fully interchangeable with either inch or metric bits from any other country. Better safe than sorry!