though this is only a .22lr, i'd venture to say (but can't prove yet) that what i thought was a toy stock may be able to handle up to a .17 hornet, .22 hornet, .204, .223, .243 if not with the original internal screws that hold the skeleton together, but replaced with beefier ones and the extra tension pins installed through the mounting blocks inside the main frame's channel described in the install thread above.
for about $125.00 for the stock and additional hardware, it's an option to consider.
it's a bit over the top, and don't want to go into mall ninja territory, but like they say anything worth doing is worth over doing.