[Matveicat]

If you want o build one, I might suggest buying a k31, its streight pull bolt could be modified without damage I suspect, as part of making the stock and changing the bolt handle you coul in effect extend it forward past the action parallel to the irons. The advantages is this is very accurate very affordable bolt action in a decent cartridge. The custom stock would need some sort of captive notch for that. The platform uses magazines or stripper clips(not internal) so not retinal damage. Use a amount of steel there as bals shield if your worried. It could double as a diverter. The stock would need to be bolted to receiver if it provided the scope mount, irons would be useless now so might aswell be sacrificed. Some would call this sacrilige on vintage gun, but if it was done well, it might be worth it.

Honestly, the biggest issue will be the trigger and safety. Relaying a trigger isn't had, doing it smoothly is. That why many Bullpups triggers are very unpopular. The RFB may have a work around, but careful tuning a dual floated relay bar between you new trigger to the old encased one. It would be some considerable work to do this all right, but not ridiculous. Te safety is very far back on this gun, and will be encased in a stock, a relay bar might be goo there to so that not only is it accessible but closer to the operators hand. That is the advantage of this rifle, its easy to convert its motions and linkages, in a good gun. The stocks aren't work of art to sacrifice either.