This subject has been discussed in the past with much vigorous controversy. You can tell by the choice of words posters have used so far (using the negative term "molesting" for instance). If you're intent on going this route you might try simply extending the forcing cones, with the modern thin plastic walled shells, merely extending the forcing cones will give good results without taking the gun out of proof (unless the Brits have changed their laws).
Steve

Approach life like you do a yellow light - RUN IT! (Gail T.)