Q: PSA GEN2 KS-47 MOE EPT LOWER RECEIVER, fit the upper 762x39 receivers.????
A: No they won't. Copied and pasted from PSA website: "Will this work with a standard AR-15 upper or will this only work with PSA KS47 upper?
ANSWER: It will only work with a PSA KS47 upper, the upper receiver is specially designed and manufactured to accept the AK mag lower.
Q: Hello, Could I instal LaRue's handguard LT15-9 on this upper? Thank you for answer)
A: LaRue's handguard LT15-9 is not compatible with gas piston systems.