In weapons.qc find the W_Attack function.
Find this portion of code within that function (do a find on MOVETYPE_FLYMISSILE)

missile = spawn ();
missile.owner = self;
self.movetarget = missile;
missile.movetype = MOVETYPE_FLYMISSILE;
missile.solid = SOLID_BBOX;
missile.classname = "missile";

// set missile speed

makevectors(self.v_angle);

missile.velocity = v_forward * 1000;
missile.angles = vectoangles(missile.velocity);

missile.touch = T_MissileTouch;

// set missile duration
missile.think = RocketAlert;
missile.frogbot_nextthink = time + 5;
missile.nextthink = 0.001;

setmodel (missile, "progs/missile.mdl");
setsize (missile, '0 0 0', '0 0 0');
setorigin (missile, self.origin + v_forward*8 + '0 0 16');

Change the above to what follows.


newmis = spawn ();
newmis.owner = self;
self.movetarget = newmis;
newmis.movetype = MOVETYPE_FLYMISSILE;
newmis.solid = SOLID_BBOX;
newmis.classname = "missile";

// set missile speed

makevectors(self.v_angle);

newmis.velocity = v_forward * 1000;
newmis.angles = vectoangles(newmis.velocity);

newmis.touch = T_MissileTouch;

// set missile duration
newmis.think = RocketAlert;
newmis.frogbot_nextthink = time + 5;
newmis.nextthink = 0.001;

setmodel (newmis, "progs/missile.mdl");
setsize (newmis, '0 0 0', '0 0 0');
setorigin (newmis, self.origin + v_forward*8 + '0 0 16');

This will stop the rocket from coming out of inside u.