[BlazingArizona]

I just read an alternate history where the confederate army was supplied with as many AK-47's as they wanted.

This was the first book of a Harry Turtledove series which is still ongoing.

[B-Chan]

Actually, THE GUNS OF THE SOUTH is not part of the current "alternate history of the USA and CSA" seies. It's a stand-alone work.

[RebelBanker]

The one with the AK-47's was Guns of the South which has no sequels. Turtledove also has an alternative history series in which the Confederacy won the War Between the States by more conventional means; the change point was some Confederate soldiers finding the lost copy of Lee's orders during the 1862 invasion of Maryland rather than them falling into Federal hands.