mil std MS21209-F1 is referenced for item description of this part except for coils; 4 1/2 no. of free coils; 2 1/4 no. of coils from end of insert to center of grip coil; item used on mt, 40mm, lchr (M5 subsys rep) fdr. delink mau-56/a coil
3b thread class 28 thread quantity per inch unthreaded tapered bottom 0.220" included in length, two locking keys on top portion grooved keylock unjf thread series