int lastAmmo = 0;
int curAmmo = 0;

while (true)
{
	lastAmmo = curAmmo;
	curAmmo = memory.readAmmo();

	lastGun = curGun;
	curGun = memory.readGun();

	//Gun not changed
	if (lastGun == curGun)
	{
		//Shots have been fired
		if (lastAmmo != curAmmo)
		{
			shotsFired = lastAmmo - curAmmo;

			handleRecoil(curGun, shotsFired);
		}
	}
}