I have one made by Roy as well. It is very accurate, love those Walthar barrels. Same length and mods as the previous poster. I am getting similar numbers.
Very accurate, more so that my .177 and .22, which only have the stock barrels.
A great gun for hunting and plinking.
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TimN
P.S. The stock is a hand carve creation, since I can't stand the factory wood. I did/do carve stocks for the QB and now the Discovery.
TimN