Not worth the trouble and expense
Over here, G11s don't bring more than about 150-200 Euros. Calfed is right, it does not make sense to try to "remilitarize" one unless you come across a dirt-cheap stock. The sleeve that keeps the barrel free-floating at the front is made of nickel silver, although for a replacement you could use just about any non-rusting thin walled tube of an appropriate size. But to fit it you have to remove the front sight assembly, which is why I had a really tricky hour cleaning the sleeve on my G96/11 when I bought it - it was clogged up with verdigris.
Considering the quality of manufacture and the accuracy, these appear to be seriousy undervalued rifles. However, the major drawback is that there is no readily available precision sight, and so a Swede upgraded with a Tunhedin sight or one of the frequently offered diopter backsights is a better proposition. The sight sets for the K31, for instance, cost more than a G11 in top condition. Replacement parts for Swiss rifles are very, very scarce.
:wave:
Patrick