Originally Posted by shadoflame
if it's just held down by the 10-32 button head screws, then you just need longer ones, but too long to where it hits the insides of the frame.
boblong direct mounts have special screws.
Correct. The "minor modification" I alluded to could be as simple as purchasing the correct length screws of a similar type, depending on the ASA. The BL ASA does use special screws as you've pointed out. My point was that unless you have your heart set on a particular on/off ASA (or already own one), you might want to purchase a dove tail mount style so you wouldn't have to change anything.