It's kind of hard to say which model is most reliable. Taken care of properly, they'll all hold true. But there are some models more prone to certain things (subframe, etc) than others, but again, the main thing is how well it was looked after by the person before you.
obÂ·tuÂ·raÂ·tor forÂ·aÂ·men. A large, oval or irregularly triangular aperture in the hip bone, the margins of which are formed by the pubis and the ischium; it is closed by the obturator membrane, except for a small opening for the passage of the obturator vessels and nerve. Synonym(s): foramen obturatum [TA] .
FIG. 4 is a cross-sectional view of a projectile at the obturator ring groove. It depicts one ring installed while the second is about to be installed. FIG. 5 is a sketch which depicts SOR engaged and placed in the obturator ring groove of a projectile to be fired from a gun tube.t the muzzle, the two or multi-pieces obturator ring will stay on or separate from the projectile body; thus eliminating ring hanging potentials (on projectile other than the ring groove) to minimize air disturbance. during projectile flight.