rondog:"I found a 1943 Underwood for sale in a gun shop. Looks to be in very good shape at first glance, but is priced at $720. Comes with sling and oiler, five 15-round mags, and a GI two-magazine sleeve on the buttstock. Could it be worth that much? Or is it far too high? I just can't force myself to order a rifle from the CMP sight unseen, and wait 6+ months for it.
__________________
Ron...........the only answer to your question can be "It depends". On the face of it that is a great price for an all USGI rifle in good shooting condition and with an issue walnut stock. If the accoutrements - the mags, sling, mag case, oiler, etc. are also issue equipment then so much the better.
However, it takes someone who is well familiar with the rifle and able to identify some of the excellent reproduction equipment as such - reproductions and not original. I'm not talking about the ability to recognize the myriad of internal markings that appear on almost every part as being original to the maker or to the time of manufacture. I only mean someone with a developed sense of what is and what is not the real deal accurately.
It can take many years to gain the dubiously valuable skill of assessing old items accurately and without that ability it may be better to place your trust in the fact that whatever you receive from the CMP will be genuine military issue (if not necessarily genuine UNITED STATES military issue).
The number of parts that were manufactured by other countries (other than Italy who did manufacture entire Garand rifles and later modified that design into a quite workable removable box magazine version of that rifle) for their use in our rifles is, in general, limited to the stocks and a limited number of Danish barrels which shoot quite well in the Garand.
Because of the way you ask your questions about the carbines it's my opinion that you ought to get over your hesitancy to order from CMP. If you really can't do that then if I were you I'd schedule a drive to Ohio and trust the folks at the North Store to set you up with a rifle for under $500.
There are a lot of ripoffs, rewelds, things not as they seem in the world of guns. If you don't know the rifles yourself no one can tell you that the rifle you found isn't one of those in an internet chatboard. The CMP will not steal from you by selling you something of that kind.