I believe that since the sentinal has a shotgun like strain and the nature of the class is to be range, i dont see why we cant have a simple sniper strain to use.
you wouldnt get armor, but you would keep your ability to change the neuro from non burst to burst, and gain range vision similar to a sniper scope for the marines. also the cost of the shots goes up from 20(non burst) to maybe 35-40 and air burst from 50 to maybe 65-70.