Its a bad idea...
I tried a lovely one for a number of months....an early HW own version with lovely grain....
It seemed to cause the gun to bounce more and this fits with whats being said above in regard to sights..
I also noticed an additional throw to the left ....require fresh adjustment to sights everytime it was put back to pistol format....
THe stock was also found to be very long in length and made the gun quite unweildy
keep it as a pistol ...