Only my Civvy perspective.... I have found the Laser bore sighter's a complete load of crap, what's the matter with good old fashioned "peer down the pipe" bore sighting, I just use a shooting bench and shooting bag, 3 inch sighting target and 100yds, works every time.

With the SUIT/L1A1 combo, I separate the TMH, remove the bolt and carrier and adjust, always puts me on target with just a few rounds to fine tune..

It won't work with L1 open sights ( obliviously) but L1A1 scope combos, it works a treat....

This method works incredibly well with my Springfield 1903A4 inparticular, always spot on a t 100yds...saves on very expensive .30-06 ammo!