Due to how the older-model front sight is mounted, you can theoretically thread/drill the hole/divot for a Tech-sight...
remove the old front sight, see what's there...may be a D/T hole, might just be a divot, ya never know
Get a Gunsmith to D/T for a Techsight if you don't have the tools/know-how...
and do NOT use a Hand-Held Drill or Dremel...EVER
Now, as far as the DIP T/G-Combo...great buy!!
However, make sure you've got a Square-backed T/G in there already, OR you'll have to do a little careful carving to make it fit.
Again, it is easy if you have the tools/know-how, but if you don't, seek a qualified gunsmith