I am confused. The FG.42, while called a rifle, was a light machinegun, more in line with the BAR than with the M1 rifle. It was intended for use by paratroops who found the standard MG.34 and MG.42 too heavy and bulky. The K.98k was truly (as the book title says) the "Backbone of the Wehrmacht".
The Germans developed rifles like the G.43 more for morale and propaganda purposes than for any actual need. (Incidentally, the G.43 and K.43 seem to be identical, and there is an ongoing discussion among German military collectors as to the differences, if any.)
There were two G.41's, the G.41M by Mauser, which never got beyond the trials stage, and the G.41W, by Walther, which was issued in considerable quantity and was the predecessor of the Walther-developed G.43.
The FN Model 49 owes nothing to the G.43; it is an entirely different rifle and functions differently. In fact, the design, by Saive, antedates the G.43 and any inspiration may have been the other way around.
The Sturmgewehr rifles did not come on stream until late 1943 and, while liked(especially on the Ostfront), never came any where near supplanting the K.98k. They were considered efficient and useful, but too heavy.
The MP.38 and MP.40 were fine SMG's, although expensive to make (compared with the British STEN and the U.S. M3), and needlessly complex. They did not, and never were intended to, supplant the infantry rifle. The SMGs were found deficient on the Eastern front because the 9mm bullets would not penetrate heavy Russian winter clothing and have any stopping power left. That was the main reason for development of the StG. rifle and cartridge (7.9 Kurz), to replace the machine pistols, not to replace the K.98k.
Jim
[This message has been edited by Jim Keenan (edited November 09, 2000).]